No Kompromat needed, just PiS doing PiS things. Poland banned imports of Ukrainian grain (because PiS has a largely rural support base and the farmers don't appreciate the competition), Ukraine filed a complaint with the World Trade Organisation, so now the Polish government is throwing what in political science is called a tamper tantrum.

Poland will have to pantomime anti-Russian rhetoric for domestic consumption, even if it aligns 100% with the Putinists. They can ramp up anti-German rhetoric (reopening the war reparations issue, making noises about “gender ideology” and “cultural Marxism” coming from across the border) and make the woke godless Germans the primary enemy of Holy Poland, though they still have to pretend to maintain defensive hostilities against the great bear to the east, even as they adopt the same policies and attitudes.

If they weren't enemies they'd already be best buddies. They share the same ideological hatred.