The pact delineated the spheres of interest between the two powers, confirmed by the supplementary protocol of the German -- Soviet Frontier Treaty amended after the joint invasion of Poland. It remained in force for nearly two years, until the German government of Adolf Hitler ended the pact by launching an attack on the Soviet positions in Eastern Poland during Operation Barbarossa on 22 June 1941.
who broke the nonaggression pact in june of 1941
the German government of Adolf Hitler