This message is a part of the ongoing Russian disinformation campaign against Poland claiming that Poland was a Nazi ally and was the main instigator of WWII. This narrative claims that Poland can only blame itself because its alleged provocatory behaviour towards the the Soviet Union was a key factor in the Soviet leadership’s decision to sign the Molotov-Ribbentrop Pact, and also in triggering German and Soviet attacks on Poland in September 1939.
The accusations that Poland was a Nazi ally and posed a “military threat” to the USSR are not confirmed by any available historical documents. Before WWII, Poland had tense political relations with Nazi Germany, which had open territorial claims to Poland (revision of the status of the Free City of Danzig and control over the “Polish Corridor”). Despite intense political pressure from Hitler, Poland refused to become a part of the Nazi block.
The accusation that the Polish authorities, by their refusal to allow Soviet troops to enter their territory, forced the Soviet leadership to sign the Molotov-Ribbentrop Pact and triggered the Soviet army's subsequent intervention in Poland in September 1939 is a clear historical manipulation. It is a fact that the Molotov-Ribbentrop Pact contained the Secret Supplementary Protocol, which assumed the division of Poland and other Eastern European countries between the USSR and Germany. The agreement to create a new German-Soviet border in the middle of Poland, as well as to consign Lithuania, Latvia, Estonia and Finland to a “Soviet sphere of interest”, was part of the secret protocol.
Thus, the signing of the Molotov-Ribbentrop Pact directly caused the German and Soviet military aggression against Poland in September 1939, which resulted in its complete occupation by Germany and the USSR. Soviet ethnic cleansing of Eastern Poland and the Baltic states began immediately after the invasion with the arrest of hundreds of thousands of Poles and Balts and their deportation to concentration camps and settlements in the east.
Read similar cases claiming that Poland was an ally of Nazi Germany and had a role in the outbreak of World War II that some European countries, especially Poland, had conspired with Nazi Germany, that Poland posed a military threat to the USSR in 1938-39 that the Soviet Union was forced and reluctant to sign the Molotov-Ribbentrop Pact.