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In 1937 Trainin published his 'The Defense of Peace and Criminal Law' in which he castigated the League of Nations for failing to make aggressive war a criminal offense and not providing for any sort of international court to punish aggressors. Along with Major-General Iona Timofeevich Nikitchenko, who also served as a judge, Trainin was a signatory for the Soviet Union to the charter of the Allies of World War II War Crimes Executive Committee which established the Nüremberg International Military Tribunal for "the prosecution and punishment of the major war criminals of the European Axis",[5] known in Russian as the "London Agreement", 'Лондонском соглашении'.
Trainin played a central role in establishing the legal framework for the Nuremberg Trials. He proposed that a new legal concept, "the crime of aggression", be used to hold Nazi Germany's military and political leadership accountable for the numerous countries they invaded and occupied. Along with the other jurists involved in crafting the Nuremberg Charter, Trainin was influential in establishing the new legal field of international law.[1] Despite this foundational role, his contributions are often ignored or forgotten by Western scholars, largely as a result of Cold War perceptions of the Soviet Union. More recent scholarship has begun to acknowledge the influence of Soviet legal thought on international law, arguing that Trainin's contributions must be taken seriously, alongside an ongoing recognition of the crimes of the Soviet regime.[1]
Trainin later became a Corresponding member of the Academy of Sciences of the USSR (1946). In 1947 and 1948 he served as vice-president of the International Association of Democratic Lawyers. His major works were On Complicity (1941) and Elements of a Crime According to Soviet Criminal Law (1951).
In 1945, in Fundamental Principles of Soviet Criminal Law, he wrote,[6]
Soviet law combines formal definition of crime with material definition of it. Soviet law defines crime as an act of commission (or omission) dangerous to the community, transgressing the foundations of the Soviet System or Socialist law and order (material feature) and entailing punishment by law (formal feature).
Trainin was awarded two Orders of the Red Banner of Labor.