The International Military Tribunal for the Far East was convened to try the leaders of Japan for war crimes.
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London Charter of the International Military Tribunal happened
in 1945.
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The war criminals were in the Pacific Ocean and the seas around
the South Pacific and Australia and China.
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I would say the Pacific and East Asia, but others would have
different names, most probably the Pacific, regarding it as a
single theater of war.
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The Prime Minister (18 October 1941 to 22 July 1944) at that
time was Hideki Tojo who was sentenced to death by the
International Military Tribunal for the Far East .