The only people Bandera and his crew hated more than Russians, were Poles. They were despicable characters, on par with the Ustashe in Croatia.
They were stuck between a rock and a hard place. Both Poland and Russia wanted the Ukraine. The Poles divvied up Czechoslovakia with the Nazis. The Russians gave the Nazis a free hand to invade the West via the Molotov-Ribbentrop Pact, and helped supply them in that effort. All the players in the war were despicable in some form or fashion. Bandera at least had the excuse that Ukraine was friendless and being attacked from all sides.