Why would they?
Because they want their share in power and access to
koryto. Duh!
demotywatory.pl/5207492/Zgadnijcie-kto-stal-z-pisowskimi-oficjelami-na-paradzie
Agrounia, a large chunk of PSL (remember all the drama with Małgorzata Zych?)
You'd have to give me some sources for that, because Małgorzata Zych is just one person.
Really, Poland is not such a Ukraine-supporting monolith as some people try to picture it and as PiS is trying to convince us.
That would be understandable considering our difficult history - there isn't going to be 100% monolith. But as for being pro-RuSSian (as in pro-Putin's RuSSia) - that's a tiny minority in Poland, imho.