Korean War two years of fighting became a war of attrition, with the front line close to the 38th parallel. The war in the air, however, was never a stalemate. North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in air-to-air combat for the first time in history, and Soviet pilots covertly flew in defense of their communist allies. The fighting ended on 27 July 1953, when an armistice was signed. The agreement created the Korean Demilitarized Zone to separate North and South Korea, and allowed the return of prisoners. However, no peace treaty was ever signed,
Soviet Union in the Korean War the war to rebuild the country. Soviet soldiers were instrumental in the creation and early development of the North Korean People's Army and Korean People's Air Force, as well as for stabilizing the early years of the Northern regime. The Shineuiju Air Force Academy was founded under Soviet leadership on 25 October 1945 in order to train new pilots. Because at the time the war broke out in 1950, the Communist Soviet Union, China and their allies were already locked into a "Cold War" with capitalist countries, both sides felt that the Korean Conflict carried the potential to further destabilize