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,
Sweden in the Korean War personnel and 2,400 Korean personnel were treated by Swedish doctors. Because of Sweden's reputation for neutrality during the major 20th century conflicts (First World, Second World and Korean Wars), Sweden was included as one of the four founding members of the Neutral Nations Supervisory Commission and several Swedish military personnel served in Korea enforcing the Panmunjom armistice. Sweden was the first Western European country to establish diplomatic relations and an embassy in North Korea. Sweden in the Korean War Sweden took part in the Korean War by providing the Swedish Red Cross Field Hospital and participating in the Neutral Nations