Stalin did consider the possibility of war in Asia, as opposed to Europe. In January 1950, he approved Kim Il Sung's proposal to conquer South Korea in what became the Korean War that summer, believing that victory there would discredit NATO. The gambit backfired, however; despite their initial optimism the Communists were unable to defeat the US-led forces in Korea, and the war greatly increased Western military spending, for the first time making NATO a significant threat against the Soviets in Europe. By late 1950, the USSR notified its Eastern European satellites to prepare for war by the end of 1952, a date matching Western estimates. In early 1951, based on an alleged NATO plan to launch a European war that year from Western proxy Yugoslavia during the Informbiro period as a response to its defeat in Korea, he ordered a massive increase in Eastern European forces that hurt the weaker Communist economies. Based on the Korean precedent, the Soviets apparently expected that the West would not use atomic weapons in a European war. During Stalin's lifetime, Soviet doctrine foresaw the next war as a more destructive version of World War II similarly decided by giant armies supported by massive home fronts, a type of conflict which benefited from the Soviet Union's innate strengths.