Cash, Sanctions, and Realpolitik: The ICC’s Appeal to Tokyo

The Hague has long operated under the comfortable assumption that international legal institutions exist above the fray of superpower geopolitics. That illusion has evaporated once again. Caught in an escalating confrontation with Washington, the International Criminal Court finds itself turning to its top financial backer, Japan, to fend off what threatens to become a structural unwinding.

Last week, the administration of US President Donald Trump levied sanctions directly against ICC President Tomoko Akane and a senior trial lawyer. The move follows years of tension over the tribunal's investigations, notably its decision to seek an arrest warrant for Israeli Prime Minister Benjamin Netanyahu—a key American ally—and an earlier probe into US military actions in Afghanistan. Washington, which never ratified the court’s founding statute, has made no secret of its desire to neutralize the body's influence, urging member states to pack their bags.

At least five nations have already bowed out, signaling that multi-national judicial bodies only retain authority so long as major powers tolerate them. In response, Akane held a video briefing with journalists in Tokyo, appealing directly to her homeland. Japan, which joined the tribunal in 2007, provides the largest share of the court's funding. Akane argued that Tokyo must use its diplomatic weight to prevent neighboring member states from bowing to Washington's pressure, while also attempting to dissuade the US from further measures.

For Tokyo, however, the request creates a delicate diplomatic dilemma. Japanese Prime Minister Sanae Takaichi characterized the latest US sanctions as very unfortunate, yet her cautious posture has drawn sharp criticism at home. Human rights advocates, opposition politicians, and members of Takaichi's own governing party have demanded a far more assertive defense of the court. Balancing an indispensable security alliance with Washington against a principled commitment to international legal frameworks leaves Tokyo with little room to maneuver.

Established in 2002 to prosecute genocide, war crimes, and crimes against humanity, the ICC relies entirely on voluntary compliance and international goodwill. Deprived of hard enforcement power, it remains vulnerable when powerful non-members decide to challenge its legitimacy. Whether Japan chooses to expend political capital to shield the Netherlands-based institution will test not just Tokyo's diplomatic appetite, but the structural durability of post-war international law.

Written by Sandy van Dongen sandy.vandongen@alpineweekly.com