International agreements are frequently described as unenforceable, which understates how compliance actually works and overstates what enforcement means domestically.
The absence of a central enforcer
No body with general authority to compel states.
Which is the structural difference from domestic law, and it means compliance rests on other mechanisms.
Those mechanisms are more effective than the absence of enforcement suggests, and compliance with international obligations is generally high.
Why states comply
Reciprocity, since agreements provide benefits that non-compliance risks.
Reputation, since a state known to breach agreements finds future negotiation harder.
Domestic incorporation, since obligations frequently become domestic law enforceable in national courts.
Bureaucratic routine, since agencies implement obligations as ordinary practice.
And domestic constituencies, since agreements create interests that support compliance.
Hard and soft obligations
Treaties create binding obligations under international law.
Declarations, guidelines and political commitments do not, and can influence behaviour substantially through norm creation and reporting.
Which means the binding character does not straightforwardly predict effect.
Reservations
States can join treaties while excluding specific provisions, subject to limits.
Which allows broader participation at the cost of consistency, and extensive reservations can hollow out an agreement.
Objections to reservations by other parties have legal effects that are technically complex and rarely consequential in practice.
Dispute settlement
Some agreements provide mechanisms — panels, tribunals, courts — with varying compulsory jurisdiction.
Which require consent in most cases, given at the time of joining or at the time of dispute.
Remedies are generally declaratory or involve authorised counter-measures rather than direct enforcement.
Monitoring and reporting
Many agreements require periodic reporting and provide for review.
Which produces information and creates opportunities for pressure, and it is the primary mechanism in human rights and environmental treaties.
Shadow reporting by civil society organisations provides alternative accounts, which is a significant function.
Withdrawal
Generally permitted with notice specified in the agreement.
Which means states are not permanently bound, and withdrawal carries reputational and reciprocal costs.
Some agreements contain no withdrawal clause, and the position under general international law is then contested.
Domestic incorporation
Determines whether obligations are enforceable in national courts.
Monist systems treat ratified treaties as domestic law directly.
Dualist systems require implementing legislation, which means an obligation can be binding internationally and unenforceable domestically.
Which is the distinction that determines whether an individual can rely on an international obligation in a national court.
Customary international law
Obligations arising from general practice accepted as law, binding without any agreement.
Which covers fundamental rules including on use of force and treatment of diplomats.
Establishing that a rule has become customary requires evidence of practice and of acceptance, which is frequently contested.
Implementation gap
Ratification is not implementation, and many obligations require domestic action that does not follow automatically.
Which is where compliance most commonly fails — not through deliberate breach but through domestic capacity, competing priorities or federal structures complicating implementation.
Technical assistance provisions in many agreements address capacity constraints specifically.
Non-state actors
Increasingly significant in international arrangements.
Which includes companies, cities and civil society organisations making commitments and participating in monitoring.
Their commitments are not binding under international law and can be substantively significant.
Sanctions
Measures imposed by states or by international bodies to compel compliance.
Evidence on effectiveness is mixed and depends on multilateral participation, on the target's alternatives and on the specificity of the demand.
Targeted sanctions on individuals and entities have largely replaced comprehensive measures, following evidence on humanitarian effects.
Negotiation and ratification
Negotiation is conducted by executives and ratification generally requires legislative approval.
Which means a negotiated text can fail domestically, and negotiators must anticipate this.
Provisional application, where agreements take effect before ratification completes, is used and is contested.
Reservations to human rights treaties
Extensive reservations have been entered to several major instruments.
Which raises the question of whether reservations incompatible with the object and purpose of a treaty are valid, and treaty bodies have taken positions that states dispute.
Interpretation
Treaties are interpreted according to established rules — ordinary meaning, context, object and purpose, with supplementary reference to negotiating history.
Which produces disputes that dispute settlement mechanisms resolve where they exist.
Multilateral and bilateral
Multilateral agreements involve many parties, which makes negotiation slower and the resulting norms broader.
Bilateral agreements are faster and produce a patchwork of differing obligations.
Which has been the direction of travel in trade as multilateral negotiation stalled, with consequences for coherence.
Finding the text
Treaty texts and ratification status are published in official registries and are searchable.
Which allows claims about obligations to be checked directly, and the texts are frequently shorter than expected.
Reservations and declarations entered by specific states are recorded alongside.
Domestic effect in practice
Whether an obligation can be relied on in a national court determines its practical value to individuals.
Which varies by system and by treaty, and it is worth establishing before assuming a right is enforceable.