When the Rome Statute entered into force in 2002, it represented one of the most ambitious experiments in international institution-building since the founding of the United Nations. For the first time, a permanent court existed to prosecute individuals—not states—for genocide, crimes against humanity, and war crimes.

Two decades on, the International Criminal Court occupies a peculiar position in the global governance landscape. It has secured convictions of warlords and former heads of state. It has also faced withdrawals from member states, sanctions from a permanent UN Security Council member, and persistent accusations of selective justice.

Understanding the ICC requires holding two truths simultaneously. It is a genuine institutional achievement that has expanded the architecture of international accountability. It is also a deeply political body operating in a world where the most powerful states have never accepted its jurisdiction. The tension between these realities defines what the Court can and cannot do.

The ICC was deliberately designed not to replace national justice systems but to complement them. Under the principle of complementarity, the Court can only exercise jurisdiction when national authorities are unwilling or unable to genuinely investigate or prosecute serious crimes themselves.

This design reflects a careful institutional compromise. States negotiating the Rome Statute were unwilling to surrender their sovereign authority over criminal prosecution, but they recognized that some governments would never investigate atrocities committed by their own forces or allies. Complementarity threads this needle by making the ICC a backstop rather than a primary venue.

In practice, complementarity creates incentives that extend far beyond The Hague. The mere possibility of ICC involvement can prompt domestic legal reforms, encourage national prosecutions, and shift political calculations. Colombia's lengthy peace process with the FARC, for example, was shaped by awareness that inadequate accountability measures could trigger ICC scrutiny.

Yet complementarity also produces strategic ambiguity. Governments can stage limited prosecutions to deflect international attention. Determining when a state is genuinely investigating versus performing investigation is itself a politically fraught judgment, one the Court must make while preserving relationships with the states whose cooperation it requires.

Takeaway

Institutions designed as backstops shape behavior most powerfully when they are rarely used—their influence operates through anticipation rather than action.

By the ICC's tenth anniversary, every active investigation involved an African situation. This pattern fueled accusations from the African Union and several member states that the Court had become an instrument of neocolonial justice, targeting weak states while ignoring atrocities committed elsewhere.

The defense offered by the Court and its supporters has two parts. First, many African investigations were self-referrals—governments in Uganda, the DRC, Mali, and the Central African Republic asked the ICC to intervene. Second, Africa has experienced a tragic concentration of mass atrocities during the Court's operational period, and African civil society has been among the strongest proponents of international accountability.

Both critiques contain truth. The crimes the ICC has prosecuted were real, and many African victims have welcomed its involvement. At the same time, the Court's caseload reflected structural realities of global power: it could investigate where it had jurisdiction and where powerful states did not block it. Situations involving Western military actions or Chinese conduct remained effectively untouchable.

The Court has gradually diversified its docket, opening investigations into Georgia, Bangladesh, the Philippines, Venezuela, and Ukraine. Whether this rebalancing arrives in time to repair the institution's legitimacy with African states—Burundi withdrew in 2017, the Philippines in 2019—remains an open question of considerable consequence.

Takeaway

An institution's legitimacy depends not only on what it does, but on the visible pattern of who it acts upon and who it leaves alone.

The United States signed the Rome Statute under President Clinton, unsigned it under President Bush, and has oscillated between cautious engagement and outright hostility ever since. This relationship illustrates a fundamental tension in global governance: institutions designed to constrain the powerful tend to be opposed by them.

American resistance has taken striking forms. The American Service-Members' Protection Act of 2002—sometimes called the Hague Invasion Act—authorizes the use of force to free U.S. personnel held by the Court. Bilateral immunity agreements were pressed on dozens of countries. In 2020, the Trump administration imposed financial sanctions on the ICC's own prosecutor.

The proximate cause of recent tensions has been the Court's interest in conduct by U.S. forces in Afghanistan and, more recently, Israeli officials regarding Gaza. Washington's objections rest on jurisdictional arguments—neither the United States nor Israel is a party to the Rome Statute—but the underlying concern is straightforward: powerful states resist external judgment of their military conduct.

This dynamic exposes the structural limit of the ICC. International criminal justice can constrain officials of medium and weaker states, particularly those without great-power patrons. It struggles to reach the conduct of permanent Security Council members and their close allies, creating a tier of effective impunity that no institutional reform can easily remedy.

Takeaway

Every institution of global governance must eventually confront a question it cannot answer through procedure alone: what holds when the powerful refuse to be held.

The ICC's first two decades reveal both the possibilities and the limits of building accountability into the international system. It has produced convictions that would have been unimaginable a generation ago and contributed to a global norm against impunity for the gravest crimes.

It has also demonstrated that legal institutions cannot transcend the political realities that produced them. The Court reflects a world in which sovereignty remains primary, great powers retain effective immunity, and selective enforcement is the price of any enforcement at all.

Reforming the ICC requires accepting this honestly. Expanding jurisdiction, strengthening cooperation mechanisms, and diversifying case selection are worthwhile. But the deeper work lies in building the political coalitions—across regions and across power asymmetries—that any meaningful international institution ultimately requires.