Rome Statute of the International Criminal Court

The Rome Statute was adopted on July 17, 1998, at a UN Diplomatic Conference, with 120 states voting in favor, 21 abstaining, and 7 voting against — including the United States, China, and Russia. The treaty entered into force July 1, 2002, after 60 ratifications. It defines four crimes with greater precision than any prior instrument. Genocide (Art. 6) requires proof of specific intent to destroy a national, ethnical, racial, or religious group — a demanding threshold that distinguishes it from mass atrocity. Crimes against humanity (Art. 7) cover 11 specified acts committed as part of a widespread or systematic attack on a civilian population. War crimes (Art. 8) incorporate and expand Geneva Conventions grave breaches. The crime of aggression (Art. 8 bis), activated in 2018, covers planning or executing an act of aggression by a person in a position to direct a state's military or political action.

The Statute's complementarity principle (Art. 17) is its operational core. The ICC does not displace national criminal systems — it only acts when national courts are 'unwilling or unable' to genuinely prosecute. A state can block ICC jurisdiction over its nationals by conducting a genuine national investigation, even one that results in no charges. 'Unwillingness' includes proceedings designed to shield perpetrators; 'inability' covers situations where the judicial system has collapsed. This structure creates a strong incentive for states to pursue domestic accountability as the primary response, with the ICC as a backstop when they fail.

The United States has a complex and often hostile relationship with the Rome Statute. The Clinton administration signed the treaty in 2000 but declined to submit it for Senate ratification. The Bush administration formally withdrew the US signature in 2002 — an unprecedented diplomatic act — and secured bilateral immunity agreements with over 100 states pledging not to surrender US nationals to the ICC. Congress passed the American Servicemembers' Protection Act (ASPA), which authorized the President to use 'all means necessary' to free US personnel held by the ICC — earning it the nickname 'The Hague Invasion Act.' Yet the US has selectively supported ICC prosecutions against adversaries while insisting on blanket US immunity. In 2020, the Trump administration imposed sanctions on ICC officials investigating potential US crimes in Afghanistan.