The Battles of Khalkhyn Gol (Mongolian: Халхын голын дайн; Japanese: ノモンハン事件; Japanese Romaji Nomon-Han Jiken; Russian: бои на реке Халхин-Гол; Chinese: 诺门坎事件; pinyin: Nuò mén kǎn shìjiàn) constituted the decisive engagement of the undeclared Soviet–Japanese border conflicts fought among the Soviet Union, Mongolia and the Empire of Japan in 1939. The conflict was named after the river Khalkhyn Gol, which passes through the battlefield. In Japan, the decisive battle of the conflict is known as the Nomonhan Incident (ノモンハン事件, Nomonhan jiken) after a nearby village on the border between Mongolia and Manchuria.