Trigger Letter - Notifying a State of a Dispute in Eurasia

Something has gone wrong with your investment abroad, and you have started to wonder whether you can start an arbitration against your host State. Before you get to that question, there is an earlier one that almost nobody asks in time: have you told the State and attempted to resolve the dispute through proper channels?

Most investment treaties will not let you file for arbitration until you have given both parties a genuine opportunity to settle the dispute amicably. The instrument that does the telling is a letter, usually called a notice of dispute or a notice of intent, and practitioners call it the trigger letter because of what it sets in motion. It is a relatively simple document and one of the few that can end the case before it begins. I edit the Jus Mundi Wiki Note on the subject, which is the short version. This is the version I would give you across a table.

What is the cooling-off period in investor-State arbitration?

The cooling-off period is the interval a treaty requires you to engage in settlement negotiations with the host State, after notifying the State of a dispute, before you may formally commence arbitration. The purpose is to give both sides a defined window to settle the dispute amicably without a tribunal. Almost 90% of treaties contain one, and the usual length is three or six months. The only way to know yours is to read the relevant clause.

Not every treaty imposes one. Some older instruments set a waiting period instead: a requirement that a stated time has elapsed before arbitration may be commenced, expressed without a notice to start it and with any reference to negotiation put in hortatory terms. The difference is worth holding onto, because a waiting period may be measured from the date the dispute arose, which means it can be running before anything has been written.

Where a treaty does impose a cooling-off period, the clause is usually drafted around negotiation rather than around the passage of time, and that drafting has consequences for how the period is used. If an investor sends the letter and then hears nothing until the months expire, respondent States have argued that the period was not used as the treaty intended and have put that forward as a bar to the arbitration going ahead. How far such an argument goes depends on the wording of the clause and on what each side actually did, and it is contested, so it is not a proposition to accept in the abstract. It is, though, a foreseeable line of attack, and the answer to it is evidential rather than legal: a record setting out the parties' conduct throughout the negotiation window, built as it happens rather than reconstructed later.

The clause also decides when the cooling-off period itself begins, which is usually the date your notice reaches the State. That is one deadline, and it is rarely the only one.

A treaty claim can be governed by several periods running at once, and they are measured from different events:

• The cooling-off period, which ordinarily runs from your notice, and which you control by choosing when to send it.
• A limitation period for bringing the claim at all, which typically runs from the events complained of, or from the date you knew or ought to have known of the breach and the loss. The 2023 CIS Agreement sets three years on that basis.
• A waiting period under some older BITs, which is a condition of time rather than an obligation to negotiate, and which may be measured from the date the dispute arose rather than from any letter. The United States–Kazakhstan BIT of 1992 is drafted that way.
• Conditions precedent in some newer treaties, such as a requirement to pursue local remedies for a stated number of years before the cooling-off period may be set in motion.

The distinction matters because these clocks do not move together. Sending the notice starts the cooling-off period, and it does nothing to stop a limitation period that began when the events occurred. An investor who spends a year deciding whether to write may have preserved every day of the cooling-off window and lost a year of the limitation period. So the useful question reaches past the cooling-off period: which periods are running, from what date each was measured, and which of them you can still affect.

What must a notice of dispute contain under a bilateral investment treaty?

It depends on the treaty, and the honest answer is that many treaties say very little. What a well-drafted notice commonly identifies is:

• You and your investment — the investor entity, its nationality, and what it owns
• The measures you are challenging — what the State did, and when
• The treaty provisions you invoke — which protections you say were breached
• The factual and legal basis of the claim
• The relief you are seeking

In Burlington Resources Inc. v. Republic of Ecuador, the tribunal held that although the treaty did not contain formal notice requirements, it required “evidence of some form or another that allegations of treaty breach have been made.” The tribunal therefore found the claims inadmissible under Article VI(3).

Three points follow from that award, and they hold across the instruments discussed below. The requirement is treaty-specific, so the clause governs and the checklist above is only a starting point. A tribunal may decline to take the claim forward where it is not satisfied that the State was told. And where an investor argues that negotiation would have been futile, respondents contest it and tribunals have not treated it uniformly, so it is better relied on as a supporting argument than as a substitute for the letter.

Which category of treaty are you under?

The treaties covering the CIS and Central Asia fall broadly into three categories, and they were drafted to very different requirements.

Category one: the post-Soviet BITs of the 1990s. Canada–USSR, the Netherlands–Uzbekistan and Turkey–Uzbekistan treaties, and the rest of that network. These say little about procedure, and they do not all say the same thing. Where a notice is called for, the treaty is typically silent or minimal on what it must contain: no enumerated list, no prescribed addressee, often no stated form. That silence leaves you largely where Burlington leaves you, asking whether the State was notified of the alleged breach sufficiently to give it a meaningful opportunity to settle the dispute amicably. Others in the same generation prescribe no notice at all and require only that time has passed, which is the waiting period described above and the pattern of the United States–Kazakhstan BIT. Reading the clause is what tells you which of the two you are in.

Category two: the regional instruments. The 1997 CIS Convention, the 2008 EurAsEC Agreement, the EAEU Treaty of 2014 and the CIS Agreement of 2023. One drafting lineage, 26 years apart at the ends, and the youngest of them is stricter about the contents of a trigger letter than anything that preceded it in the region.

Category three: the 2024–2026 bilateral wave. New BITs across Kazakhstan, Kyrgyzstan, Uzbekistan and Tajikistan, several of which impose conditions precedent that dwarf a six-month cooling-off period.

The 1997 CIS Convention is worth a separate mention. Article 11 is a single sentence sending investment disputes to the courts or arbitration courts of the countries party to them, the Economic Court of the Commonwealth of Independent States, and other international courts or arbitration bodies. There is no notice requirement, no negotiation stage and no cooling-off period, so there is no clock to miss. There is also no clearly expressed standing offer to arbitrate, so an investor whose only route is Article 11 may have to establish consent before reaching the merits.

When does the clock start under the EAEU Treaty?

It starts when somebody puts the request in writing. The investment provisions of the Eurasian Economic Union Treaty sit in Annex 16, in force since 1 January 2015 for Armenia, Belarus, Kazakhstan, Kyrgyzstan and Russia, and paragraphs 84 and 85 are near word-for-word descendants of the 2008 EurAsEC text.

Paragraph 84 provides that disputes between a recipient State and an investor of another member State, including disputes over the amount, conditions or procedure for paying compensation, "shall be settled if possible by way of negotiations." Paragraph 85 then provides that if a dispute cannot be settled through negotiation "during a period of 6 months from the date of the written request by any party to the dispute about the settlement by way of negotiations," the investor may elect a competent court of the recipient State, international commercial arbitration at the chamber of commerce of an agreed State, ad hoc arbitration under the UNCITRAL Rules, or ICSID and its Additional Facility.

Three features of that treaty may catch out an inexperienced drafter.

The clock is tied to the letter. Six months is measured from the written request (or its receipt by the State), which suggests that until something is put in writing the period may not begin to run at all. An investor who spends two years in correspondence with a ministry, without ever requesting negotiations under the relevant provision of Annex 16, may find a respondent arguing that the clock never started.

Either side may be able to start it. The text says "the written request by any party to the dispute," which on its face allows the State to set the six months running as well, at a moment that suits its own preparation rather than yours. Where you want the negotiation window to open once your investigation is ready, writing first is the way to keep that timing in your hands.

Annex 16 says nothing about contents. No enumerated list, no addressee, no prescribed form. That is likely to put the weight of any argument on proving that a written request for negotiations was made and when it was received, which makes the date and the method of delivery worth engineering carefully.

What must the letter say under the 2023 CIS Agreement?

Article 36 sets the terms, and it is the strictest drafting in the region. The CIS Agreement on Free Trade in Services, Establishment, Activities and Investment was signed at Sochi on 8 June 2023, and it entered into force on a staggered schedule: Belarus, Kyrgyzstan and Tajikistan from 5 June 2024, Russia from 24 July 2024, Armenia from 13 November 2024 and Kazakhstan from 11 June 2025, with Uzbekistan yet to ratify. The date your host State came under it is the first thing to check, because it decides whether Article 36 governs your letter at all.

To the extent Article 36 is applicable, it answers three questions the older instruments leave open.

What the request must contain. Article 36(1) requires the investor to submit a written request for negotiations to the other Party. Article 36(2) then provides that the request shall include:

1. the investor's full name, actual and legal address, and the full name and addresses of any representative, together with documents proving that representative's authority;
2. the legal and factual basis of the request, "including all contested measures and situations";
3. the provisions of the Agreement which, in the investor's opinion, the contested measures do not comply with;
4. the investor's proposals for a possible settlement.

Who it must go to. Article 36(3) provides that a request "shall not be considered duly submitted if it does not contain the information specified in paragraph 2 of this Article or if it is not submitted to the authorized body of the Party." Article 36(4) requires each Party to notify the depositary of its authorized bodies within 30 days of entry into force, and the list is published on the depositary's website. The intended addressee is therefore a matter of public record, and an investor who serves elsewhere should expect that to be raised.

What happens to everything you leave out. Article 36(7) is the provision to read twice. Measures or situations that were not provided for in the request for negotiations "may not be referred to arbitration," the later request to refer the dispute "shall not add to or change the claims set out in the written request for negotiations," and the arbitration body "shall not have the right to accept for consideration disputes and to render a decision on the conformity of a measure of a Party with the provisions of this Agreement if such measure or provisions were not specified in the written request for negotiations."

That last clause is drafted more tightly than the enumerated treaties that fix the perimeter of the case by requiring each claim to appear in the notice. Article 36(7) addresses itself to the tribunal as well as to the parties, and it may be read as denying the tribunal any power to reach a measure the letter left out. On that reading an omission may not be curable. The provision has not been tested, and how far it goes is a question a tribunal has yet to answer.

Kazakhstan has entered a reservation, and its scope is narrow enough to state precisely. It applies where a Chapter 5 claim is brought against Kazakhstan under subparagraph (a) of Article 36(5), the domestic arbitral option, and sends that dispute to the Court of the Astana International Financial Centre instead. The UNCITRAL route at subparagraph (b) is untouched. If your route runs through the AIFC Court, its enforcement practice is worth reading before you commit to it, and I have written separately on whether the AIFC Court can enforce foreign arbitral awards.

Alongside all of this sits an outer deadline. The Agreement imposes a three-year limitation period running from the date the investor received, or reasonably should have received, information about the alleged breach.

How do the newer Central Asian BITs change the arithmetic?

They can add years to the front of the process. A wave of new bilateral treaties has come through the region since 2024, and several of them impose conditions precedent that make a six-month cooling-off period the smallest part of the timetable.

• Kazakhstan–Kyrgyzstan BIT (2024) — Signed 19 April 2024, ratified by Kazakhstan early 2025; replaces a 1997 agreement
• India–Uzbekistan BIT (2024) — Signed September 2024, in force 15 May 2025
• China–Tajikistan BIT (2024) — In force 20 August 2025
• Italy–Uzbekistan BIT (2025) — Signed May 2025, awaiting entry into force
• China–Kazakhstan BIT (2025) — Signed June 2025; Kazakh ratification law adopted 6 May 2026, pending Senate and promulgation
• Japan–Tajikistan BIT (2025) — Signed 19 December 2025, not yet in force
• Jordan–Uzbekistan BIT (2025) — Signed August 2025, awaiting entry into force

The India–Uzbekistan BIT is the worked example. It follows India's post-2016 Model BIT, which requires an investor to exhaust local remedies, judicial and administrative, for a minimum of five years, and only then to observe a further six-month cooling-off period before serving a notice of dispute, with a notice of arbitration at least 90 days before formally initiating. Reported conditions include an outer limit of six years from the date the investor first became aware of the loss, and domestic proceedings concluded no more than twelve months before arbitration is begun.

The same investor may be subject to several treaties applicable to its investment with different cooling-off periods and requirements for the trigger letters. Under a 1990s Uzbekistan BIT there may be no specified notice requirement at all. Under the 2024 India–Uzbekistan BIT, the same investor in the same host State is looking at a local-remedies requirement measured in years before the cooling-off clock may be triggered.

The strategic decision this treaty structure calls for is crucial. An investor structuring an investment today may end up holding arbitration paths under a 1990s BIT, under Annex 16 and under the 2023 Agreement at once, with three different answers to "what must my letter say", "how many letters I need to send", and two different clocks running. The newer and better-drafted instrument is sometimes the slower one. Choosing between them is part of drafting the letter and has to happen before it goes out. The broader regional map sits in my longer piece on ISDS in Central Asia.

What should be checked before sending a trigger letter?

The trigger letter should say enough to preserve the claim, but no more than you can stand behind.

A notice of dispute is written at the worst possible moment: early, when your own investigation is incomplete, and when you may still hope the matter settles. That creates a temptation to overstate the facts, and an equal temptation to say too little. The practical middle is a letter that is specific about the measures and the protections invoked, and measured about the facts still under investigation.

Three things to have checked before it goes:

1. Which instrument actually protects this investment, where more than one might.

   Nationality of the investing entity and the route by which it holds the asset decide which treaties apply, and in the CIS and Central Asia the answer is frequently more than one. The contents of your letter, the addressee, the length of the negotiation period and the forums open at the end of it all change with that choice, so it is made first.

2. When the clock starts, and whether it has already started.

   Annex 16 starts at the written request, in terms that appear to let either side send it. The 2023 Agreement measures from a request that meets the Article 36(2) checklist, and Article 36(3) gives a respondent a ready argument that a request missing an item was never duly submitted. Some older BITs set no cooling-off period at all and impose a waiting period instead, measured from the date the dispute arose rather than from any notice. The United States–Kazakhstan BIT of 1992 is one: Article VI(3)(a) allows the investor to consent to arbitration "[p]rovided that the national or company concerned has not submitted the dispute for resolution under paragraph 2 (a) or (b) and that six months have elapsed from the date on which the dispute arose." Article VI(2) says only that the parties "should" initially seek a resolution through consultation and negotiation, and prescribes no notice. This is the clause that most often surprises people.

3. Who must be served, and how.

   Under the 2023 Agreement the authorized body is published by the depositary, so the addressee is ascertainable before you send. Most older treaties say only that notice goes to the "other party," without naming a department or agency, and the correct addressee has to be worked out from the host State's own constitutional and investment legislation before anything is sent.

None of that has to be worked out alone, and little of it is worth working out alone. You can send the letter yourself, and in practice many investors do. What is worth doing first is having counsel carry out the underlying investigation and review the draft before it goes. The contents are difficult to revise later, a respondent will read the notice against your pleadings years afterwards, and the letter also opens a period in which you are expected to negotiate.

What to do if you are reading this at the wrong end of the timeline

If the period has not started, you have the most valuable thing available: the ability to choose when it does. Notifying the State opens a negotiation window you may be able to use, and under Annex 16 it also takes that choice away from the State.

If you think the period may have expired, that is a reason to take advice quickly rather than a reason to assume the claim is gone. Whether it has depends on how the clause is drafted, what the State already knows, and what was communicated and when.