Predictions of an expected Soviet defeat had an important impact on President Roosevelt; while the United States was not at the time at war, Roosevelt favored the Allies (represented primarily at that time by the British Empire and the Soviet Union), and decided to try to avert the collapse of the USSR by extending to the Soviets (October 1941) the supply of munitions through Lend-Lease (which had started in March 1941), and also to pressure Japan not to attack while the USSR was so vulnerable. The Red Army held the line at the outskirts of Moscow (December 1941) and predictions of Soviet collapse changed to "uncertain"