You are just playing a bit of seller Kissinger. I can't imagine how " happy " might be Poland to invest in western Ukraine worshiping Bandera and calling donated stuff as banderomobiles...and demanding money for...LOL recosnstruction from their taxpayers...You should update yourself on what Kremlin's propaganda actually says.
The main motif would be the dychotomy of Ukrainian heroes who fought alongside Russians as brothers, and nazi collaborators and their modern day heirs.
It is to this day taught in schools in Russia that from all USSR Ukraine lost second most people in WWII after Russia, and produced second most Heroes of the USSR after Russia.
However, Ukraine was never homogenous, since what we call "Ukraine" are in fact 3 very diffirent regions formed into one republic. Western Ukraine was never happy with becoming part of the USSR, and was always rather different from Russia, culturally and politically. They had lots of people who viewed Hitler as a liberator, at least in the early years of the war. Eastern Ukraine was mostly pro- USSR, and Novorossia (territories which are called DPR and LPR today) was effectively Russia, with everyone speaking Russian and being culturally identical to people from neighbouring Russian provinces.
Bolsheviks were terribly incompetent in the matter of national politics. They made a lot of mistakes we're suffering from till this very day.
Making East and West Ukraine parts of the same republic was a mistake. Probably if they held a vote and let Western Ukraine be independent or join Poland, it would be better for everyone, but alas.
Russian propaganda is designed for lazy idiots and 99% russians are lazy idiots living in dreams, doesn't matter where they are located and what kind of papers they does have.