 For comparison, the Soviet Union was more willing to provide direct military support to prolong the war.In addition to the Sino-Soviet Non-Aggression Pact signed in August 1937, a barter agreement was negotiated to trade munitions for strategic materials such as tungsten and antimony.Starting in 1937 Soviet war material was transported through Xinjiang (Sinkiang) to Lanzhou (Lanchow) using 20,000 camels.