The grim headlines of the Gaza and Ukraine wars make Judgment at Tokyo: World War II on Trial and the Making of a Modern Era, especially timely reading. Bass, an international relations scholar at Princeton University, crafts a splendid account of the Tokyo war crimes trials after the Second World War, looking closely at the lessons and limitations of the Allied attempt to administer justice to the defeated Japanese aggressors. The complex and flawed proceeding laid out the scale of death and destruction from Japan's 1931-1945 war in Asia and the Pacific, and the author dissects the intricate, imperfect process of adjudicating blame for the cataclysm.

The Allies faced numerous complicating factors setting up the International Military Tribunal for the Far East, making the 1946-48 proceedings less definitive than the Nuremberg trials that sent many top Nazi leaders to the gallows. While Bass asserts that postwar tribunals are appropriate, if not completely effective ways to mark the end of a conflict, his thorough, nuanced analysis of the political, personal and judicial complications that shaped the Tokyo trials make a foundational case for its imperfect results.

In 1946 the United States sat at the zenith of its global power as sole possessor of nuclear weapons and one of few Allied nations not subject to the ravages of the Second World War on its home soil. It took charge of occupying Japan and positioned itself as the unipolar postwar power in the Pacific, countering an expansion-minded Soviet Union and the ascendant Chinese Communist forces chipping away at Chiang Kai-Shek's corrupt, tottering Nationalist government.

General Douglas MacArthur, the imperious, politically conservative soldier who effectively ruled Japan during the occupation, sought to pin responsibility for the 1941 attack Pearl Harbor on the Japanese military leadership through the tribunal, while ensuring that Emperor Hirohito was not held responsible for the war. Despite plenty of evidence to the contrary, the emperor's continued reign was crucial to keeping Japan on side in the nascent Cold War.

Besides Hirohito's complex role in the war's origins, other Allied interests, going back to Japan's conquest of Manchuria in 1931, made a simple exercise in victors' justice impossible. Even the composition of the tribunal reflected the complex task at hand: America, Australia, Canada, New Zealand, Britain, France, the Netherlands, the Soviet Union, India, China and the Philippines all sent judges to Tokyo, representing nations baying for vengeance - and colonies seeking independence from these same victorious nations.

Readers learn the personal histories of the 28 leaders on trial, and the machinations of the U.S. to ensure that Emperor Hirohito was not held responsible for the war. For some, Bass argues, the trial was a miscarriage of justice. The verdicts, which sent wartime leader General Hideki Tojo and six other defendants to the gallows, 16 to life in prison, and acquitted six more, condemned several civilian government ministers who were hostage to a maniacally militaristic war cabinet and were unable to express antiwar views for well-grounded fears of assassination.

Judgment at Tokyo: World War II on Trial and the Making of Modern Asia | By Gary J. Bass | Knopf | 912 pp. | $46