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and they conveniently ignore that France and the rest signed pacts with the Nazis long before the USSR did and rejected all offers to cooperate with the USSR
IIRC, France had a secret agreement with the Soviets under which they would both defend Czechoslovakia in the event of a German invasion. But the plan depended on the support of the United Kingdom and Italy, which refused to help. In addition, Poland refused to allow Soviet troops to enter its territory to help Czechoslovakia.