The Battle of Lake Khasan was a 1938 border clash between Soviet and Japanese-Manchukuo forces that tested both nations' military capabilities before World War II.
Key Facts
- Duration
- 29 July – 11 August 1938
- Also known as
- Changkufeng Incident
- Treaty at dispute
- Treaty of Peking (Russia–Qing China)
- Outcome
- Japanese withdrawal after fighting and diplomatic settlement
Location
Cause → Event → Consequence
Japan believed the Soviet Union had misinterpreted the boundary demarcation established by the Treaty of Peking between Imperial Russia and Qing China, and had tampered with the demarcation markers. This conviction led Manchukuo, the Japanese puppet state, to plan a military incursion into territory that the Soviet Union claimed and controlled near Lake Khasan.
From 29 July to 11 August 1938, Japanese and Manchukuo forces occupied the disputed area around Lake Khasan, engaging Soviet troops in heavy fighting. The conflict represented a direct military confrontation between Soviet and Japanese forces over the contested border region, with both sides suffering significant casualties before the situation was resolved.
Following intense combat, Japanese forces withdrew from the disputed territory after a diplomatic settlement was reached. The battle demonstrated Soviet military capacity to resist Japanese encroachment and contributed to Japan's subsequent strategic decisions, including its eventual decision to pursue expansion southward rather than against the Soviet Union.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent