For Japan, the U.S. decision to sanction Tomoko Akane is far more than an uncomfortable diplomatic episode. On August 18, the Trump administration placed the president of the International Criminal Court under sanctions, targeting a jurist whose career Tokyo has long presented as evidence of Japan’s commitment to the international legal order.
The measures freeze property and interests in property that fall under U.S. jurisdiction, sharply restrict financial dealings and bar Akane from entering the United States. Washington says the ICC has overreached by asserting authority over nationals of countries that never accepted the court’s jurisdiction.
The political contradiction is hard to miss. The United States is penalising a citizen of one of its closest Asian allies not for acting against America or Japan, but for serving in an institution that Tokyo has supported for nearly two decades and finances more heavily than any other member state.
Japan had tried to keep the dispute from reaching this point. Its government favoured quiet diplomacy, hoping to persuade American officials not to blacklist Akane while avoiding a public rupture with the White House. That strategy failed, leaving Tokyo with a conflict it had worked hard to postpone.
According to Daycom’s analysis of the public record and the legal positions of the governments involved, the case exposes a structural tension in Japanese foreign policy. Japan depends on American military power for its security while also depending on international rules to constrain the behaviour of much larger states.
Japan joined the Rome Statute in 2007 and has since invested substantial political and financial capital in the ICC. In recent years, its assessed contribution has amounted to roughly 15 per cent of the court’s budget, making Tokyo the institution’s largest national financial supporter.
Akane embodies that investment. A veteran Japanese prosecutor with more than three decades of legal experience, she was nominated by Japan, elected to the ICC bench and began serving in The Hague in 2018. In March 2024, fellow judges elected her president of the court, the first Japanese national to hold the position.
Her rise also carried symbolic importance at home. Akane entered Japan’s prosecutorial service in the early 1980s, when women remained rare in senior legal positions. Her eventual elevation to the presidency of the world’s permanent criminal court was therefore seen not merely as a personal success, but as a national one.
Ukraine occupies an important place in her judicial record. Akane was one of three judges on Pre-Trial Chamber II when, in March 2023, it issued an arrest warrant for Vladimir Putin over the alleged unlawful deportation and transfer of Ukrainian children from occupied territories.
A distinction matters here. Akane was not a member of the chamber that issued arrest warrants in November 2024 for Israeli Prime Minister Benjamin Netanyahu and then-defence minister Yoav Gallant. By that time, she was leading the court institutionally as its president rather than sitting on that particular panel.
That difference helps clarify the scale of Washington’s campaign. The United States is no longer applying pressure only to judges directly responsible for a particular ruling. Sanctions have expanded to more members of the court, turning a dispute over individual decisions into a broader challenge to the ICC’s institutional capacity.
The American legal argument is longstanding. The United States is not a party to the Rome Statute and rejects the idea that the ICC can exercise authority over Americans without Washington’s consent. The Trump administration extends the same logic to allies such as Israel, which also does not recognise the court’s jurisdiction.
The ICC starts from a different premise. Palestine is a party to the Rome Statute, and the court therefore argues that it may exercise territorial jurisdiction over crimes allegedly committed on Palestinian territory, regardless of the nationality of the suspect. That is the central legal fault line in the confrontation.
The dispute, then, is not merely about Netanyahu or the politics of one U.S. administration. It reflects two incompatible concepts of international criminal justice: one centred on the sovereign consent of states, and another allowing territorial jurisdiction granted by a member state to reach nationals of non-member countries.
For Japan, that argument becomes especially uncomfortable when Russia enters the picture. Tokyo has supported Ukraine, imposed sanctions on Moscow and repeatedly insisted that force cannot be allowed to rewrite borders. The ICC warrant against Putin fitted comfortably within Japan’s language of accountability.
But the universality of international law is tested when the same institution acts against friends as well as adversaries. If Tokyo loudly supports the court when Russia is targeted but retreats when the ICC clashes with U.S. or Israeli interests, its claim to defend a universal legal standard becomes harder to sustain.
That is why Akane’s designation has become a test of Japanese diplomacy. When dozens of countries signed a joint declaration in 2025 defending the ICC’s independence after an earlier wave of U.S. sanctions, Japan was conspicuously absent despite being the court’s largest financial backer.
Tokyo instead chose private engagement. Japanese officials sought to protect Akane without forcing a confrontation with Washington, reflecting the country’s traditional preference for managing disputes with its principal ally behind closed doors. The latest sanctions show the limits of that method.
Prime Minister Sanae Takaichi’s reaction was restrained but significant. She described the decision as deeply regrettable, while the Foreign Ministry reaffirmed Japan’s commitment to strengthening the rule of law and maintaining support for the ICC. There was no threat of retaliation or wider diplomatic rupture.
That caution reflects strategic reality. The U.S.-Japan alliance remains the foundation of Japan’s defence posture, particularly as Tokyo faces a more powerful China, a nuclear-armed North Korea and an increasingly confrontational Russia. In the short term, there is no equivalent substitute for American security guarantees.
At the same time, Japan has spent decades compensating for the limits of its own military power through support for treaties, multilateral institutions and the rule of law. For a middle power, international law is not merely a moral preference. It is one way of making the behaviour of stronger states more predictable.
The Akane sanctions strike directly at that strategic logic. Japan benefits from a world in which legal restraints apply beyond the preferences of the most powerful countries. If major states can impose material penalties on judges whenever rulings conflict with national interests, that system becomes less dependable for everyone.
American sanctions also possess unusual extraterritorial force because of the centrality of the U.S. financial system. Formally, restrictions apply through American jurisdiction, but global banks and companies often avoid sanctioned individuals altogether to reduce exposure to U.S. penalties or disruption of dollar-based business.
For a senior international judge, the impact can therefore extend far beyond an inability to visit the United States. Banking, payment services, digital platforms and commercial relationships may all become more difficult. A legal designation can turn into pressure on the everyday functioning of an international institution.
That is why the ICC presents the campaign as a threat to judicial independence rather than simply a dispute over foreign policy. Its argument is straightforward: if judges can be financially punished for decisions taken within their mandate, the material cost of applying the law begins to depend on the tolerance of affected governments.
Washington sees the issue in almost the opposite way. From the Trump administration’s perspective, a court that claims authority over officials of states that never joined it is itself violating legitimate sovereign boundaries. Sanctions are therefore framed not as an attack on justice, but as a defence against institutional overreach.
Both sides speak in the language of law, but the deeper dispute is about power. The ICC has no police force and depends on member states to execute warrants. The United States, by contrast, possesses financial tools capable of imposing immediate and global consequences on individuals far beyond American territory.
That asymmetry goes to the heart of the crisis. The ICC was created partly on the premise that law should be able to place limits on political power. Yet if a great power can personally penalise judges for rulings it rejects, the practical independence of international criminal justice becomes harder to sustain.
None of this makes the ICC immune from serious criticism. The court has faced questions over slow proceedings, cost, enforcement failures and the geographic imbalance of some earlier investigations. Japan itself, as a major donor, has repeatedly pressed for greater efficiency and stronger financial discipline.
But institutional criticism and personal sanctions against judges are fundamentally different instruments. One seeks reform through legal procedures and the member states that govern the court. The other imposes direct material consequences on individuals because of decisions made in the exercise of judicial authority.
For Tokyo, the problem is intensified by Akane’s status. She is not simply a Japanese citizen who happened to build a career abroad. Japan nominated her to the court and celebrated her ascent as evidence of its own commitment to international justice. Defending her independence now tests how much those declarations are worth under pressure.
Japan is likely to continue favouring discreet diplomacy, seeking relief for Akane without allowing the dispute to destabilise its alliance with Washington. That approach is consistent with decades of Japanese statecraft: preserve the strategic relationship even when disagreements with the United States become serious.
Yet the cost of adaptation is rising. If sanctions against international judges become an accepted tool of statecraft, other governments gain additional justification for applying their own forms of pressure. Russia has already targeted ICC officials after the warrant for Putin, albeit through a different legal and political mechanism.
For Japan, such a trend is especially troubling. Its foreign-policy model assumes that rules must be broadly applicable precisely because Tokyo cannot compel every major power to follow them. A system in which international law applies selectively loses much of the strategic value Japan expects it to provide.
The Tomoko Akane case therefore extends far beyond the fate of one judge. It marks the boundary between two visions of international order: one in which security flows chiefly from alignment with the strongest ally, and another in which even powerful states accept external legal constraints on their actions.
For decades, Japan largely avoided having to choose between those visions. The American alliance and the so-called rules-based international order were treated as mutually reinforcing parts of the same architecture. Under Donald Trump, that assumption can no longer be taken for granted.
Tokyo is highly unlikely to let a dispute over the ICC rupture its relationship with Washington. The regional security stakes are too high. The more difficult question is whether Japan can continue to defend both its alliance and the legal principles that it says make international security durable.
That is why the central figure in this story may ultimately be not Akane, but the state that sent her to The Hague. The judge has made her position clear by continuing her work. Japan must now decide how firmly it will defend an international order when the pressure on that order comes not from an adversary, but from its most important ally.
