The summer of 1939, near the Mongolian village of Nomonhan, would see the largest clash between the Soviet Union and Japan of the interwar years, and it would have important ramifications for relations between the two nations as the world was rapidly descending into war.

Sources:

• Anti-Russian and Anti-Soviet Subversion: The Caucasian-Japanese Nexus, 1904-1945 by Hiroaki Kuromiya and Georges Mamoulia
• Japanese Geopolitics and the Mongol Lands, 1915-1945 by Li Narangoa
• Khalkin-Gol: The Forgotten War by Amnon Sella
• The Lake Khasan Affair of 1938: Overview and Lessons by Alvin D. Coox (1973)
• Soviet-Japanese Confrontation in Outer Mongolia: The Battle of Nomonhan-Khalkin Gol by Larry W. Moses (1967
• Nomonhan: Japan Against Russia, 1939 by Alvin D. Coox
• Nomonhan, 1939: The Red Army's Victory That Shaped World War II by Stuart D. Goldman

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