noun
Nomonhan Incident; Battle of Khalkhin Gol
Refers to the 1939 Soviet–Japanese border conflict. In Japanese, ノモンハン事件 is the common name; in English both 'Nomonhan Incident' and 'Battle of Khalkhin Gol' are used.
ノモンハン事件は1939年に満州国とモンゴルの国境で起きた。
The Nomonhan Incident occurred in 1939 on the border between Manchukuo and Mongolia.
Named after the village of Nomonhan (ノモンハン) near the Khalkhin Gol (ハルハ河) where the conflict took place. 事件 means 'incident' or 'affair'.