“You can’t sue a country — unless it decided to act like a company.” The ancient principle that states cannot be hauled before foreign courts, and its rapidly proliferating exceptions.
Executive Summary
Sovereign immunity is the legal doctrine — rooted in the principle par in parem non habet jurisdictionem (equals have no jurisdiction over equals) — that a sovereign state cannot be subjected to the jurisdiction of foreign domestic courts without its consent. In its absolute form, it shielded states from all civil litigation. Modern practice, however, has shifted toward restrictive immunity, under which states retain protection for governmental (acta jure imperii) functions but waive or lose immunity for commercial activities (acta jure gestionis). The distinction is consequential: sovereign debt, state-owned enterprise contracts, and overseas asset ownership increasingly expose states to litigation — and the weaponization of legal processes for geopolitical ends has made sovereign immunity a frontline of great-power competition.
The Strategic Mechanism
Immunity operates differently across functional categories:
Full immunity retained:
- Diplomatic premises and personnel (Vienna Convention)
- Military assets and warships
- Central bank reserves in most jurisdictions (with major exceptions)
Restricted immunity / waivable:
- Commercial contracts entered by SOEs and state agencies
- Sovereign bonds with explicit waiver clauses (standard in international bond issuance)
- Arbitration award enforcement where state voluntarily submitted to arbitration
Contested / evolving:
- Enforcement against central bank assets: Courts in New York, London, and Paris have diverged on whether central bank reserves are attachable for debt judgments
- Human rights and jus cogens violations: Some jurisdictions recognize exceptions for egregious international law breaches (genocide, torture)
- Sanctions-driven litigation: OFAC and EU sanctions have generated litigation testing immunity boundaries as states seek to recover blocked assets
Market & Policy Impact
- Sovereign bond structuring: All major sovereign Eurobonds since the 1990s contain explicit immunity waivers in New York or English law governing clauses — they are non-negotiable for market access
- Russian frozen assets: The $300 billion in frozen Russian central bank assets held in Western jurisdictions has generated intense legal debate over immunity, with Belgium’s Euroclear at the center of the dispute
- Venezuela litigation: U.S. courts’ willingness to attach Venezuelan state assets — including PDVSA subsidiary Citgo — for bond defaults has redefined sovereign asset vulnerability
- China SOE disputes: Western courts are grappling with whether actions by Chinese state-owned enterprises engaging in commercial activity strip the Chinese state of immunity when disputes arise
- Multilateral debt restructuring: The G20 Common Framework’s effectiveness is limited in part by creditors’ ability to attach assets through litigation if official restructuring fails
Modern Case Study: Russian Frozen Assets and Immunity Debates, 2022–2025
The immobilization of approximately $300 billion in Russian central bank reserves — held primarily via Euroclear in Belgium — following Russia’s 2022 Ukraine invasion triggered the most consequential sovereign immunity legal battle in decades. The assets were frozen under EU and G7 sanctions, but not formally confiscated. From 2023 onward, debates intensified over whether the interest earned on those assets (~$3 billion annually) could be transferred to Ukraine without constituting an unlawful expropriation of sovereign property. Belgium adopted legislation in 2024 enabling use of windfall interest income, carefully structured to avoid direct confiscation of principal. Russia filed suits in multiple jurisdictions asserting immunity violations. Legal scholars were divided — some arguing the unprecedented sanctions regime had effectively waived Russia’s immunity claims; others warning that confiscation would undermine the sovereign bond market by signaling that central bank reserves are attachable. By 2025, no G7 government had moved to seize the principal, illustrating the doctrine’s continued gravitational force even in extreme geopolitical circumstances.