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After the collapse of the USSR Poland revitalized the idea of Intermarium project, which foresees the creation of a buffer out of bordering states. Intermarium remains part of Polish domestic and foreign policies and illustrates its imperial ambitions. By attracting Ukrainian and Belarusian migrants, running a propagandistic campaign against Ukrainian and Belarusian governments and Russian world concept, Polish authorities aim to establish anti-Russian Intermarium and to feed animosities between the representatives of the [all-Russian] community.
Polish Giedroyc-Mieroszewski doctrine is still in place and envisages, among other things, weakening Russia by tearing Belarus, Ukraine, Moldova, and Caucasian countries away, pulling Ukraine, Moldova, and Georgia in the EU and NATO, bringing cheap labour force from Ukraine and Belarus for the benefit of the Polish economy.
This is a conspiracy theory and misrepresentation of actual Giedroyc-Mieroszewski doctrine. See here for a similar example. The message contains recurring pro-Kremlin narratives about Poland's imperialistic plans to partition Belarus and Ukraine and to establish the Fourth Republic and to disrupt Belarus-Russia and Ukraine-Russia ties.
The mentioned doctrine was developed in the 1970s by Polish émigrés Jerzy Giedroyc and Juliusz Mieroszewski. The doctrine urged the need to rebuild good relations among Central and Eastern European countries and framed Poland's relations with Ukraine, Lithuania and Belarus as the foundation of its foreign policy. This called for Poland to reject any imperial ambitions and controversial territorial claims, and to accept the post-war border changes. The doctrine supported independence for Belarus and Ukraine. It did not promote the idea to establish a Polish empire at the expense of Poland's eastern neighbours. See here for more information about the Giedroyc-Mieroszewski doctrine.
Claims about Poland's alleged ''imperial dreams'' are part of recurring disinformation narrative, which aim is to deteriorate Poland’s relations with its neighbours.
See earlier disinformation messages alleging that Poland plans to establish an anti-Russian buffer zone including Belarus, that it wants to dismember Ukraine and re-establish a Polish empire, and that the Polish doctrine of IV Rzeczpospolita is part of the US doctrine of global dominance.