Suspension of Treaties

Suspension of Treaties refers to the temporary cessation of the operation of a treaty, either in whole or in part, without necessarily bringing the treaty itself to an end. During suspension, the treaty remains legally in existence, but the affected obligations are temporarily not required to be performed to the extent of the suspension.

The principal provisions concerning suspension are contained in Articles 57–60 of the Vienna Convention on the Law of Treaties, 1969 (VCLT).

Meaning of Suspension

Suspension means the temporary interruption of the operation of a treaty.

The basic distinction is:

Termination → treaty comes to an end

Suspension → treaty remains in existence but temporarily ceases to operate

For example:

Treaty in force

↓

Ground for suspension

↓

Suspension

↓

Temporary non-performance

↓

Treaty resumes operation

Nature of Suspension

Suspension does not normally destroy the treaty.

During the period of suspension:

• the treaty remains legally in existence;
• the affected obligations are temporarily not operative;
• the parties may resume performance when the suspension ends;
• other provisions may continue to operate if the suspension is only partial.

Therefore, suspension is generally temporary, whereas termination is generally permanent.

Suspension by Agreement

Under Article 57 VCLT, the operation of a treaty may be suspended:

• in conformity with the provisions of the treaty; or
• at any time by consent of all the parties after consultation with the other contracting States.

Thus, the parties themselves may agree to temporarily stop the operation of the treaty.

Suspension According to Treaty Provisions

A treaty may expressly provide for suspension.

It may specify:

• circumstances in which suspension is permitted;
• whether the entire treaty or particular provisions may be suspended;
• the procedure for suspension;
• duration of suspension;
• conditions for resuming operation.

Where such a provision exists, the parties must follow the procedure established by the treaty.

Suspension Between Certain Parties

A multilateral treaty may sometimes be suspended only between particular parties.

Under Article 58 VCLT, two or more parties to a multilateral treaty may conclude an agreement to suspend the operation of provisions of the treaty temporarily and as between themselves where the relevant conditions are satisfied.

The suspension must:

• not affect the rights of other parties;
• not affect the performance of the treaty by the other parties;
• not be incompatible with the treaty’s object and purpose.

Suspension by Consent of All Parties

Where all parties agree to suspend a treaty, the suspension may generally occur according to their agreement, subject to the applicable treaty provisions.

This is the simplest form of suspension because it is based upon State consent.

Suspension Through a Later Treaty

A later treaty concerning the same subject matter may result in the suspension rather than termination of an earlier treaty.

Under Article 59 VCLT, this may occur where:

• the parties to the later treaty intend to suspend the earlier treaty; or
• the provisions of the later treaty are incompatible with the earlier treaty but do not result in termination.

Therefore:

Earlier treaty

↓

Later treaty on same subject

↓

Incompatibility / intention to suspend

↓

Earlier treaty may be suspended

Suspension Due to Material Breach

Article 60 VCLT recognises material breach as a possible ground for suspension.

A material breach includes:

• repudiation of the treaty not sanctioned by the Convention; or
• violation of a provision essential to the accomplishment of the treaty’s object or purpose.

Bilateral Treaty and Material Breach

For a bilateral treaty, material breach by one party may entitle the other party to invoke the breach as a ground for:

• terminating the treaty; or
• suspending its operation in whole or in part.

Thus:

State A ↔ State B

↓

State A materially breaches treaty

↓

State B invokes Article 60

↓

Suspension or termination may follow

subject to the VCLT requirements.

Multilateral Treaty and Material Breach

The rules are more complex for multilateral treaties.

Other parties may, by unanimous agreement, suspend or terminate the treaty in relations between themselves and the defaulting State or between all parties and the defaulting State, depending upon the circumstances.

A specially affected party may also invoke the breach as a ground for suspending the operation of the treaty in whole or in part between itself and the defaulting State.

Humanitarian Treaties

Article 60 contains an important limitation regarding treaties of a humanitarian character.

Material breach does not ordinarily provide a basis for terminating or suspending provisions concerning the protection of the human person contained in humanitarian treaties.

This prevents the reciprocal breach mechanism from undermining fundamental humanitarian protections.

Suspension Due to Impossibility of Performance

Article 61 VCLT deals with supervening impossibility of performance.

Where performance becomes temporarily impossible because of the disappearance or destruction of an object indispensable for execution of the treaty, the State may, in appropriate circumstances, invoke the impossibility as a ground for suspending the operation of the treaty.

The distinction is:

Temporary impossibility → Suspension

Permanent impossibility → Possible termination or withdrawal

Suspension and Fundamental Change of Circumstances

Article 62 VCLT recognises fundamental change of circumstances as an exceptional ground.

Where the strict requirements of Article 62 are satisfied, a State may invoke the change as a ground for:

• terminating the treaty;
• withdrawing from it; or
• suspending its operation.

The doctrine is known as rebus sic stantibus.

It is interpreted narrowly because unrestricted reliance on fundamental change would undermine treaty stability.

Suspension and Diplomatic Relations

Article 63 VCLT provides that the severance of diplomatic or consular relations does not, by itself, affect the legal relations established between parties by a treaty.

However, where diplomatic or consular relations are indispensable for the application of the treaty, the consequences may differ.

Therefore:

Diplomatic relations severed

≠

Automatic treaty suspension

Suspension and Jus Cogens

The emergence of a new jus cogens norm under Article 64 can cause an existing conflicting treaty to become void and terminate.

This is therefore generally a matter of termination rather than ordinary suspension.

Suspension by Operation of Law

In some circumstances, suspension may arise from the operation of recognised rules of International Law rather than from an express suspension clause.

However, the State must establish the applicable legal basis.

A State cannot simply declare a treaty suspended without a recognised ground.

Suspension and Pacta Sunt Servanda

The principle of pacta sunt servanda, contained in Article 26 VCLT, requires treaties in force to be performed in good faith.

Suspension does not contradict this principle where suspension itself is legally justified.

Thus:

Pacta sunt servanda

↓

Treaty obligations must normally be performed

↓

Recognised ground for suspension

↓

Temporary suspension permitted

The suspension must itself comply with International Law.

Effects of Suspension

The consequences of suspension are primarily addressed by Article 72 VCLT.

Unless the treaty or parties provide otherwise, suspension:

• releases the parties from the obligation to perform the treaty in their relations with each other during the period of suspension;
• does not otherwise affect the legal relations established by the treaty between the parties.

The parties must also refrain from acts that would impede the resumption of operation of the treaty.

Partial Suspension

Suspension does not always have to affect the entire treaty.

Certain provisions may be suspended while the remainder continues to operate.

For example:

Treaty contains 20 provisions

↓

5 provisions suspended

↓

15 provisions continue to operate

where such partial suspension is legally permissible.

Suspension and Third States

In a multilateral treaty, suspension between certain parties should not adversely affect the rights of other parties or their performance of the treaty.

This is particularly important under Article 58 VCLT.

Suspension vs Termination

Suspension	Termination
Temporary cessation of operation	Ending of treaty operation
Treaty remains in existence	Treaty relationship comes to an end
Obligations may resume	Future treaty obligations generally cease
Article 57 onwards	Article 54 onwards
May be partial	May affect the entire treaty
Article 72 deals with consequences	Article 70 deals with consequences

Suspension vs Withdrawal

Suspension	Withdrawal
Temporary interruption	Departure from treaty
State generally remains party	State ceases to participate according to applicable rules
Treaty may resume operation	Treaty relationship generally ends for withdrawing State
Article 57 onwards	Article 54–56
Temporary	Generally permanent

Suspension vs Invalidity

Suspension	Invalidity
Treaty was validly concluded	Treaty suffers from a legal defect
Temporary non-operation	Concerns validity
Treaty remains legally existent	Treaty may be void
Articles 57–60	Articles 46–53
Example: material breach	Example: coercion

Suspension vs Termination for Material Breach

Material breach may lead to either suspension or termination, depending upon:

• whether the treaty is bilateral or multilateral;
• the nature of the breach;
• the position of the affected parties;
• the requirements of Article 60.

Therefore, material breach does not automatically terminate every treaty.

Important VCLT Provisions

Article	Subject
Article 54	Termination or withdrawal by consent
Article 57	Suspension by treaty provisions or consent
Article 58	Suspension by agreement between some parties
Article 59	Suspension or termination through later treaty
Article 60	Suspension or termination for material breach
Article 61	Impossibility of performance
Article 62	Fundamental change of circumstances
Article 63	Severance of diplomatic or consular relations
Article 65	Procedure concerning suspension
Article 72	Consequences of suspension

Important Case

Gabčíkovo-Nagymaros Project, 1997

In Gabčíkovo-Nagymaros Project (Hungary/Slovakia), the ICJ considered several arguments concerning the continued operation of a treaty, including necessity, impossibility, fundamental change of circumstances and material breach.

The case is important for understanding the strict conditions under which treaty obligations may be avoided, suspended or terminated.

Suspension Flowchart

Treaty in force

↓

Ground for suspension

↓

Treaty provision / consent

OR

Later treaty

OR

Material breach

OR

Temporary impossibility

OR

Fundamental change of circumstances

↓

Apply relevant VCLT requirements

↓

Suspension

↓

Obligations temporarily not performed

↓

Resumption of treaty operation

Quick Revision

• Suspension → temporary cessation of operation of a treaty.
• The treaty generally remains in existence.
• Article 57 VCLT → suspension according to treaty provisions or consent.
• Article 58 → suspension between some parties to a multilateral treaty.
• Article 59 → later treaty may suspend earlier treaty.
• Article 60 → material breach may justify suspension.
• Article 61 → temporary impossibility may justify suspension.
• Article 62 → fundamental change may, in exceptional cases, justify suspension.
• Article 63 → severance of diplomatic relations does not automatically suspend a treaty.
• Article 65 → procedure.
• Article 72 → consequences of suspension.
• Suspension may be whole or partial.
• Suspension is generally temporary.
• Termination is generally permanent.
• Withdrawal concerns the departure of a State from a treaty.
• Invalidity concerns a defect affecting the treaty’s validity.
• Material breach can result in suspension or termination depending upon the circumstances.
• Humanitarian treaty provisions concerning protection of human beings receive special protection under Article 60.
• The leading case is Gabčíkovo-Nagymaros Project (1997).
• The core distinction is:

Suspension temporarily stops the operation of a valid treaty; termination brings its operation to an end.

Conclusion

Suspension of Treaties refers to the temporary cessation of the operation of a treaty without necessarily bringing the treaty itself to an end. The principal provisions are contained in Articles 57–60 of the Vienna Convention on the Law of Treaties, 1969, with Article 72 dealing specifically with the consequences of suspension. Under Article 57, suspension may occur in conformity with the treaty’s provisions or by agreement of the parties. Article 58 permits suspension between some parties to a multilateral treaty subject to safeguards protecting the rights and obligations of the remaining parties. A later treaty may also result in suspension under Article 59, while material breach under Article 60 can provide a basis for suspension in appropriate circumstances. Article 61 may permit suspension where performance becomes temporarily impossible, while Article 62 allows suspension based on a fundamental change of circumstances only under strict conditions. The severance of diplomatic or consular relations does not automatically suspend treaty obligations under Article 63. Suspension must be distinguished from termination, withdrawal and invalidity: suspension is temporary, termination ends the treaty’s operation, withdrawal concerns a State’s departure, and invalidity concerns a defect in the treaty’s legal validity. Under Article 72, suspension releases parties from the obligation to perform the treaty during the suspension period to the extent provided, while requiring them not to impede the eventual resumption of the treaty. The ICJ’s Gabčíkovo-Nagymaros Project (1997) decision is particularly important for understanding the strict conditions governing attempts to avoid treaty performance. Ultimately, suspension provides a limited mechanism for temporarily adjusting treaty obligations while preserving the underlying treaty relationship and maintaining the principle of pacta sunt servanda.