Aron Naumovich Trainin

Aron Naumovich Trainin , also known as Moshe Aron Naumovich Trainin , or Moshe Aron Nahimovich Trainin (; – 7 February 1957), was a Soviet jurist and criminologist.

Early life and career Trainin was born in a Jewish family and attended the of Kaluga, graduating in 1903, the same year he matriculated to Moscow State University , where he graduated in 1908.

Trainin came to prominence in the inter-war years as critical of the League of Nations for not doing enough to prosecute those who waged war against peace. Scholars Francine Hirsch of the University of Wisconsin–Madison, Kirsten Sellars of the National University of Singapore, and Michelle Jean Penn of the University of Colorado Boulder credit him with establishing the international legal concept of "crimes against peace". left Trainin speaks in London in August 1945 at the Nüremberg Tribunals War Crimes Executive Committee. 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", known in Russian as the "London Agreement", ''.

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.

Trainin was awarded two Orders of the Red Banner of Labor.