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I read in The Age of Appeasement: The Evolution of British Foreign Policy in the 1930s, by Peijian Shen, that in March 1939 Ian Colvin, the Berlin correspondent of the News Chronicle reported to leading members of the British government in person:
that he had received information from various contacts in Germany which indicated that Poland was Hitler's next victim, and an attack on her could be made very soon, perhaps around the end of March.

What if Colvin's information had been true? How would the Soviet Union have reacted to a German invasion of Poland at that time. In OTL Neville Chamberlain made the declaration of the British government's guarantee to Poland on 31 March 1939. So presumably in this scenario Britain would declare war on Germany. What are likely developments for the course of the war?
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