Recurring pro-Kremlin narrative claiming that the United States fully control the foreign policy of Poland. See other examples of this message here, here and here.
Poland's decision not to invite the Russian delegation to WWII commemoration ceremony has to do with Russian aggression against Ukraine. Krzysztof Szczerski, Chief adviser to the Polish president, stated in March 2019 that the anniversary ceremony will be held “in the company of countries with whom Poland now cooperates closely for peace, based on the respect for international law, for the sovereignty of nations and of their territories”. This point was reiterated by Jacek Sasin, Polish Deputy Prime Minister in July, who said: "I think it would be inappropriate to mark the anniversary of the beginning of the armed aggression against Poland with the participation of a leader who today treats his neighbours using the same methods."