Why can't the ICC prosecute Putin for the crime of aggression?

Because Russia is not an ICC member and the Kampala Amendments restricting the Court's aggression jurisdiction to member states means the ICC cannot prosecute the crime of aggression against Russian nationals for attacking Ukraine.

Has the special tribunal been formally established?

s of early 2026, the tribunal has not been formally established. The Core Group of states continues treaty negotiations and institutional design work, with the Netherlands proposed as a seat location.

Would Putin have head-of-state immunity before the tribunal?

This is legally contested. The ICC's statute removes head-of-state immunity before the Court, but whether a new treaty-based tribunal can do the same depends on customary international law interpretation and which states ratify the tribunal's statute.

What precedent does the Nuremberg tribunal set?

Nuremberg established that aggression is an international crime and that political leaders can be held personally accountable. However, it was established by victorious powers with custody of defendants — a situation that does not apply to the current Russia-Ukraine context.

Could the tribunal actually arrest and try anyone?

In the short term, any tribunal would likely conduct proceedings in absentia or hold preliminary proceedings while building a record. Actual trials would require either voluntary surrender, regime change in Russia, or a future political settlement providing enforcement mechanisms.

Special Tribunal Proposals for Russian Aggression Against Ukraine

By UWA Geopolitics Desk · Senior Geopolitics Analyst · 9 min read Published: 19 February 2026 · Updated: 23 February 2026

One of the most significant international legal debates generated by Russia's war against Ukraine concerns accountability for the crime of aggression — the act of planning and executing an illegal war — which falls outside the current jurisdiction of the International Criminal Court when the aggressor state is not an ICC member. This gap has fueled substantial advocacy for a purpose-built special tribunal, supported by Ukraine, the European Union, and a growing coalition of states, though opposed by Russia and viewed skeptically by others in the Global South.

The ICC Jurisdiction Gap on Aggression

The International Criminal Court has jurisdiction over war crimes, crimes against humanity, and genocide committed on the territory of member states or by nationals of member states. Ukraine accepted ICC jurisdiction despite not being a formal member. However, the Kampala Amendments to the Rome Statute — which define and codify the crime of aggression — contain a significant limitation: the ICC can only exercise jurisdiction over aggression when the aggressor state is a member of the Court and has not opted out. Russia is not an ICC member and has actively repudiated the Rome Statute. Consequently, while the ICC can prosecute individual Russian nationals for war crimes, it cannot prosecute Putin or the Russian leadership for the foundational crime of initiating an aggressive war — what the Nuremberg tribunals called "the supreme international crime."

The Core Group Proposal

A "Core Group" of states, coordinated through the Ukrainian government and European institutions, has been developing the legal architecture for a special tribunal specifically mandated to prosecute the crime of aggression against Ukraine. The Core Group includes EU member states, Ukraine, the UK, Canada, Georgia, and others. Two main models have been debated: a treaty-based tribunal established by a multilateral agreement among supporting states (similar to the Special Court for Sierra Leone), and a hybrid tribunal with stronger UN endorsement obtained through UNGA resolution rather than Security Council authorization. The EU has formally endorsed the tribunal concept, with Council conclusions supporting its creation, while the legal form and precise mandate remain under negotiation.

Legal Frameworks Under Consideration

The primary legal challenges for any special tribunal on aggression include: ensuring sufficient state participation to provide legitimacy; overcoming head-of-state immunity claims by Russia (since Putin would be a primary target); guaranteeing enforcement of any arrest warrants; and maintaining the independence of the proceedings from political pressure. The Nuremberg precedent is often cited but involves important differences — the post-World War II tribunals were established by victorious occupying powers with physical custody of defendants. A modern tribunal would need to function without any realistic prospect of voluntary surrender by Russian defendants, making it primarily a prospective enforcement mechanism and a symbol of international legal order pending regime change or eventual accountability.

Proposed Models for Special Tribunal on Aggression Against Ukraine
Model	Legal Basis	Immunity Issue	UN Endorsement	Key Supporters
Treaty-based international tribunal	Multilateral treaty among states	Partial — no immunity before international tribunals	Optional	EU, Ukraine, Canada, UK
Hybrid tribunal (UNGA-endorsed)	UNGA resolution + national legislation	Contested	UNGA only	EU, Netherlands, Ukraine
Expanded ICC jurisdiction	Rome Statute amendment	No immunity	UNSC or universal	Academic proposals; politically unrealistic
Domestic extraterritorial jurisdiction	National law of supportive states	Strongest immunity bar	None	Estonia, Lithuania, others

Zelensky's Advocacy and Ukrainian Government Position

President Zelensky has consistently and prominently advocated for the special tribunal, elevating it as a core diplomatic objective alongside weapons procurement and sanctions maintenance. In speeches to the European Parliament, the US Congress, and the UN General Assembly, Zelensky framed the tribunal as essential to preventing future aggressions globally — not just against Ukraine. Ukraine's government has partnered with international legal scholars to develop the tribunal's statute and with the EU to advance it diplomatically. Ukraine's position is that the tribunal must hold the highest-level political and military leadership accountable, specifically Putin, the Defense Ministry, and military commanders — individuals who designed and ordered the invasion rather than those who executed specific battlefield atrocities.

Obstacles and Global South Skepticism

Despite strong support from European and some Anglophone states, the special tribunal proposal faces meaningful opposition and skepticism. Russia and China have denounced it as a Western political instrument without legal legitimacy. Critically, several Global South states — including India, Brazil, South Africa, and many African Union members — have declined to endorse the tribunal, expressing concerns about selectivity in international justice (noting that no Western leader has faced aggression charges despite controversial military interventions), procedural fairness questions, and the precedent it might set. This skepticism limits the tribunal's universality and its ability to present itself as genuinely global accountability rather than a Western-led legal process.

The Assembly of States Parties Debate

Within the Assembly of States Parties (ASP) to the Rome Statute, there have been ongoing debates about whether the Kampala Amendments could be made applicable to non-member states through a Security Council referral or UNGA endorsement. Legal scholars are divided. Some argue that a UNGA resolution establishing the tribunal could strip Russian leadership of immunity before an internationally-constituted body; others contend that customary international law still protects sitting heads of state from prosecution before non-ICC international tribunals. The debate remains legally unresolved and politically charged, with the ultimate test being whether any enforcement mechanism could ever be applied against a nuclear-armed permanent Security Council member without its consent.

Frequently Asked Questions

Why can't the ICC prosecute Putin for the crime of aggression?: Because Russia is not an ICC member and the Kampala Amendments restricting the Court's aggression jurisdiction to member states means the ICC cannot prosecute the crime of aggression against Russian nationals for attacking Ukraine.
Has the special tribunal been formally established?: As of early 2026, the tribunal has not been formally established. The Core Group of states continues treaty negotiations and institutional design work, with the Netherlands proposed as a seat location.
Would Putin have head-of-state immunity before the tribunal?: This is legally contested. The ICC's statute removes head-of-state immunity before the Court, but whether a new treaty-based tribunal can do the same depends on customary international law interpretation and which states ratify the tribunal's statute.
What precedent does the Nuremberg tribunal set?: Nuremberg established that aggression is an international crime and that political leaders can be held personally accountable. However, it was established by victorious powers with custody of defendants — a situation that does not apply to the current Russia-Ukraine context.
Could the tribunal actually arrest and try anyone?: In the short term, any tribunal would likely conduct proceedings in absentia or hold preliminary proceedings while building a record. Actual trials would require either voluntary surrender, regime change in Russia, or a future political settlement providing enforcement mechanisms.

Sources

European Parliament Resolution on the Special Tribunal for the Crime of Aggression Against Ukraine, January 2023
Ukrainian Parliament (Verkhovna Rada) — Official Statements on Tribunal Advocacy, rada.gov.ua
Claus Kreß — "On the Activation of ICC Jurisdiction over the Crime of Aggression," Journal of International Criminal Justice, 2017 (and subsequent updates)
Chatham House — "A Special Tribunal for Aggression Against Ukraine: Too Many Obstacles?", 2022
International Criminal Court — Assembly of States Parties documentation, icc-cpi.int

Country Profile Analysis: Special Tribunal Proposals for Russian Aggression Against Ukraine

The geopolitical position and policy responses of Special Tribunal Proposals for Russian Aggression Against Ukraine in relation to the Russia-Ukraine conflict reflect a complex interplay of strategic interests, economic dependencies, historical relationships, and domestic political pressures. No country's approach to this war exists in isolation; each position is shaped by energy security considerations, trade relationships, alliance obligations, diaspora pressures, historical experiences with Russian imperialism, and calculations about regional security architecture. Understanding Special Tribunal Proposals for Russian Aggression Against Ukraine's specific context requires examining these intersecting factors comprehensively.

The economic relationship between Special Tribunal Proposals for Russian Aggression Against Ukraine and the conflict parties shapes the strategic calculus in critical ways. Dependencies on Russian energy—oil, natural gas, LNG, and nuclear fuel—have historically constrained some countries' willingness to impose or enforce sanctions. Similarly, economic interests in maintaining trade relationships with Russia or Ukraine influence policy positions on military assistance levels, sanctions enforcement, and reconstruction commitments. Special Tribunal Proposals for Russian Aggression Against Ukraine's specific economic exposures and the adjustments undertaken since 2022 illustrate how countries navigate these tensions between economic interest and strategic alignment.

Military assistance contributions from Special Tribunal Proposals for Russian Aggression Against Ukraine to Ukraine reflect both the strategic assessment of Ukraine's importance to global security and domestic political constraints on arms transfers and defense spending. The Kiel Institute for the World Economy's Ukraine Support Tracker provides quantitative analysis of bilateral aid commitments, distinguishing military, financial, and humanitarian components. Within this framework, Special Tribunal Proposals for Russian Aggression Against Ukraine's contribution level—whether leading, following, or lagging peer nations—provides insights into strategic commitment and risk tolerance regarding the conflict's outcome.

The domestic political dynamics within Special Tribunal Proposals for Russian Aggression Against Ukraine significantly influence the sustainability of support for Ukraine or neutrality toward Russia. Public opinion polling, parliamentary debates, media framing, and electoral pressures all shape what governments can commit and maintain over a protracted conflict timeline. Countries with significant pro-Russian minority populations, energy-dependent industries, or historical non-alignment traditions face particular domestic pressures that constrain foreign policy flexibility. Tracking these domestic dynamics provides essential context for assessing the durability of Special Tribunal Proposals for Russian Aggression Against Ukraine's stated policy positions.

Long-Term Strategic Implications

The war's long-term implications for Special Tribunal Proposals for Russian Aggression Against Ukraine's strategic positioning extend well beyond the immediate conflict period. NATO enlargement, European security architecture, energy supply diversification, defense industrial investment, and bilateral relationships with both Ukraine and Russia will all be shaped by the choices made during this defining period. Countries that position themselves as reliable security partners to Ukraine may gain significant influence in post-war reconstruction and European security frameworks. Those that maintained ambiguity or neutrality face different long-term strategic landscapes. The strategic choices of Special Tribunal Proposals for Russian Aggression Against Ukraine will define its role in the reshaping of European and global security architecture for decades to come.