The Soviets moved into Eastern Poland Sept 17, 1939. It was 17 days after the Germans attacked the western part.
It is unlikely that Hitler would have bothered with Poland and risk a potential eastern enemy on his eastern front. It would have been much safer to keep Poland as a buffer between Germany and the USSR. Even with troops stationed in Poland, Germany easily defeated France in the West. As quickly as France had fallen, it would have fallen faster if Germany had to be careful on the eastern front.
Poland.
it had been.
They were invaded in 1939.
Hitler invaded Poland on Friday the 1st of September 1939, and war was declared by Neville Chamberlain two days later.
Poland
At the start of World War II, Germany invaded Poland on September 1, 1939. Two weeks later, on September 17, 1939, Soviet troops occupied eastern Poland as part of their pact with Germany.
German troops invaded Poland on 1st September 1939. On 3rd September, Britain and France declared war on Germany.
Hitler had sent troops to Sudetenland before the Munich Conference and admitted it to UK Prime Minister Neville Chamberlain. Hitler basically was telling him you cannot appease me and I will do what I want. He invaded Poland after that.
It didn't. On 1 September 1939, it was invaded by German troops on its western border and later by Soviet troops from the east.
WW2 began when German troops invaded Poland.
The bloody, unmerciful invasion of Poland by the German armies convinced Britain (Finally) and France that appeasing German leaders had utterly failed. They had made the mistake of believing that Adolph Hitler was a reasonable, honorable man.