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the claim
The Soviet Union and Nazi Germany were de facto allies in September 1939.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
7 sources for · 0 against

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.

Evidence for · 7
Macmillan: The Encyclopedia of the Holocaust
1990 · cited by 0
Mentions the Nazi-Soviet pact and the resulting partition of Poland.
See more details
How claims like this are judged

Judged against reference works: claims of this kind are settled by the historical reference record, not journal abstracts.

More for · 6
Zeitschrift für Ostmitteleuropa-Forschung: Poland under German and Soviet Occupation 1939–1941: Approaches to a Comparison
2023 · cited by 0
Notes that Germany and the Soviet Union agreed on partition and invaded Poland synchronously in September 1939.
Genocidas ir Rezistencija: Vilnius, which did not become the capital of West Belarus
2009 · cited by 0
Details the partition of Poland by Nazi Germany and the Soviet Union in August-October 1939 under secret protocols.
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)
2021 · cited by 0
Discusses the 1939 Soviet-German non-aggression treaty.
OpenAIRE: Between a Rock and a Hard Place: Crossing between Nazi-Occupied and Soviet-Occupied Poland in 1939
2019 · cited by 0
States that pursuant to the Ribbentrop-Molotov pact, Nazi Germany and the Soviet Union jointly occupied Poland in September 1939.
OpenAIRE: The red army's troop mobilization in the Kiev special military district during September 1939
2003 · cited by 0
Notes the 1939 non-aggression treaty and simultaneous German and Soviet attacks/occupations of Poland.
OpenAIRE: The Red Army’s March into Poland, September 1939
1991 · cited by 0
Discusses the 1939 Non-Aggression Treaty and the Red Army's march into Poland.
Everything we examined (30)
  1. Wikipedia: Soviet Unionreferenceno side takennot shown: read and judged not to bear on this claim
  2. Book: European Regions, 1870 – 2020referenceno side takennot shown: read and judged not to bear on this claim
  3. Book: Weapons of Mass Destructionreferenceno side takennot shown: read and judged not to bear on this claim
  4. Book: Role Theory and Role Conflict in U.S.-Iran Relationsreferenceno side takennot shown: read and judged not to bear on this claim
  5. Book: Weapons of Mass Destruction [2 volumes]referenceno side takennot shown: read and judged not to bear on this claim
  6. Book: European Union and NATO Expansionreferencesupportsnot shown: a book whose author and subject did not establish authority here
  7. Book: Stress of War, Conflict and Disasterreferenceno side takennot shown: read and judged not to bear on this claim
  8. Routledge: Fascist ideology : territory and expansionism in Italy and Germany, 1922-1945referenceno side takennot shown: read and judged not to bear on this claim
  9. McGill-Queen's University Press: Austria in World War II : an Anglo-American dilemmareferenceno side takennot shown: read and judged not to bear on this claim
  10. Lorimer: The Chamberlain-Hitler Collusionreferenceno side takennot shown: read and judged not to bear on this claim
  11. Monthly Review Press: In our time : the Chamberlain-Hitler collusionreferenceno side takennot shown: read and judged not to bear on this claim
  12. Prentice Hall: Society, state, and nation in twentieth-century Europereferenceno side takennot shown: read and judged not to bear on this claim
  13. Macmillan: The Encyclopedia of the Holocaustreferencesupports
  14. Four Courts Press: Ireland, Germany and the Nazis : politics and diplomacy, 1919-1939referenceno side takennot shown: read and judged not to bear on this claim
  15. Scarecrow Press: Historical dictionary of the Holocaustreferenceno side takennot shown: read and judged not to bear on this claim
  16. Wikisource: Judgement of IMT at Nurembergreferenceno side takennot shown: read and judged not to bear on this claim
  17. Wikisource: NIS 14, Poland, Government and Politicsreferenceno side takennot shown: read and judged not to bear on this claim
  18. Wikisource: United States – Vietnam Relations, 1945–1967: A Study Prepared by the Department of Defense/I. C. Ho Chi Minh: Asian Tito?referenceno side takennot shown: read and judged not to bear on this claim
  19. Zeitschrift für Ostmitteleuropa-Forschung: Poland under German and Soviet Occupation 1939–1941: Approaches to a Comparisonpeer-reviewedsupports
  20. Genocidas ir Rezistencija: Vilnius, which did not become the capital of West Belaruspeer-reviewedsupports
  21. 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)peer-reviewedsupports
  22. Слово.ру: балтийский акцент: Workers’ settlements in the Kaliningrad region and their subsequent renaming in 1946—1947peer-reviewedno side takennot shown: read and judged not to bear on this claim
  23. Genocidas ir Rezistencija: Jonas Kimštas-Žalgiris – personality and biographical traitspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  24. Theatrum Historiae: Letecká báze na Českomoravské vysočiněpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  25. OpenAIRE: The Oil Strategies of Nazi Germanypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  26. OpenAIRE: Between a Rock and a Hard Place: Crossing between Nazi-Occupied and Soviet-Occupied Poland in 1939peer-reviewedsupports
  27. OpenAIRE: The red army's troop mobilization in the Kiev special military district during September 1939peer-reviewedsupports
  28. OpenAIRE: The Red Army’s March into Poland, September 1939peer-reviewedsupports
  29. OpenAIRE: The Nuclear Spiespeer-reviewedno side takennot shown: read and judged not to bear on this claim
  30. OpenAIRE: 1943-1945: Italian enforced laborers in Germany. Men and women forced to support German military effortspeer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 7505 Aug 2026
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