Molotov–Ribbentrop Pact has effect Soviet invasion of Poland
Poland never will rise again in the form of the Versailles treaty. That is guaranteed not only by Germany, but also ... Russia.In the opinion of Robert Service, Stalin did not move instantly but was waiting to see whether the Germans would halt within the agreed area, and the Soviet Union also needed to secure the frontier in the Soviet–Japanese Border Wars. On 17 September, the Red Army invaded Poland, violating the 1932 Soviet–Polish Non-Aggression Pact, and occupied the Polish territory assigned to it by the Molotov–Ribbentrop Pact. That was followed by co-ordination with German forces in Poland. Polish troops already fighting much stronger German forces on its west desperately tried to delay the capture of Warsaw. Consequently, Polish forces could not mount significant resistance against the Soviets. On 18 September, The New York Times published an editorial arguing that "Hitlerism is brown communism, Stalinism is red fascism...The world will now understand that the only real 'ideological' issue is one between democracy, liberty and peace on the one hand and despotism, terror and war on the other."On 21 September, Marshal of the Soviet Union Voroshilov, German military attaché General Köstring, and other officers signed a formal agreement in Moscow co-ordinating military movements in Poland, including the "purging" of saboteurs and the Red Army assisting with destruction of the "enemy". Joint German–Soviet parades were held in Lvov and Brest-Litovsk, and the countries' military commanders met in the latter city. Stalin had decided in August that he was going to liquidate the Polish state, and a German–Soviet meeting in September addressed the future structure of the "Polish region." Soviet authorities immediately started a campaign of Sovietisation of the newly-acquired areas. The Soviets organised staged elections, the result of which was to become a legitimisation of the Soviet annexation of eastern Poland.Modification of secret protocols
Eleven days after the Soviet invasion of the Polish Kresy, the secret protocol of the Molotov–Ribbentrop Pact was modified by the German–Soviet Treaty of Friendship, Cooperation and Demarcation, allotting Germany a larger part of Poland and transferring Lithuania, with the exception of the left bank of the River Scheschupe, the "Lithuanian Strip", from the envisioned German sphere to the Soviet sphere. On 28 September 1939, the Soviet Union and German Reich issued a joint declaration in which they declared:
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