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the claim
The Soviet Union and Nazi Germany were de facto allies in September 1939.
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SUPPORTED
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Recorded sources
7 sources for · 0 against
Is it true that the Soviet Union and Nazi Germany were de facto allies in September 1939?
Yes. Historical evidence confirms that through the Molotov-Ribbentrop Pact and their coordinated invasions and partition of Poland in September 1939, Nazi Germany and the Soviet Union acted as de facto allies at the start of World War II.
Verdict: SUPPORTED · 7 sources for, 0 against · Last checked
How claims like this are judged
Judged against reference works: claims of this kind are settled by the historical reference record, not journal abstracts.
Evidence for · 7
Mentions the Nazi-Soviet pact and the resulting partition of Poland.
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Macmillan: The Encyclopedia of the Holocaust. (1990). Macmillan. https://archive.org/details/encyclopediaofho0003unse
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More for · 6
Notes that Germany and the Soviet Union agreed on partition and invaded Poland synchronously in September 1939.
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Pulvermacher, A. (2023). Zeitschrift für Ostmitteleuropa-Forschung: Poland under German and Soviet Occupation 1939–1941: Approaches to a Comparison. Zeitschrift für Ostmitteleuropa-Forschung. https://doi.org/10.25627/202372411428
Details the partition of Poland by Nazi Germany and the Soviet Union in August-October 1939 under secret protocols.
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Boćkowski, D. (2009). Genocidas ir Rezistencija: Vilnius, which did not become the capital of West Belarus. Genocidas ir Rezistencija. https://doi.org/10.61903/GR.2009.101
Discusses the 1939 Soviet-German non-aggression treaty.
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Kudryavtsev, A. (2021). Гуманитарные и юридические исследования: THE SOVIET-GERMAN NON-AGGRESSION TREATY OF 1939: A STRATEGIC GAIN OR TRAGIC MISTAKE OF THE USSR (ON THE 80TH ANNIVERSARY OF SIGNING THE TREATY). Гуманитарные и юридические исследования. https://humanitieslaw.ncfu.ru/jour/article/view/111
States that pursuant to the Ribbentrop-Molotov pact, Nazi Germany and the Soviet Union jointly occupied Poland in September 1939.
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OpenAIRE: Between a Rock and a Hard Place: Crossing between Nazi-Occupied and Soviet-Occupied Poland in 1939. (2019). OpenAIRE. https://doi.org/10.14746/seg.2013.7.15
Notes the 1939 non-aggression treaty and simultaneous German and Soviet attacks/occupations of Poland.
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OpenAIRE: The red army's troop mobilization in the Kiev special military district during September 1939. (2003). OpenAIRE. https://doi.org/10.1080/13518040308430550
Discusses the 1939 Non-Aggression Treaty and the Red Army's march into Poland.
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OpenAIRE: The Red Army’s March into Poland, September 1939. (1991). OpenAIRE. https://doi.org/10.1007/978-1-349-21379-5_1
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Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 7505 Aug 2026
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