NEW: Russian diplomats expelled by Poland were targeting Ukrainian refugees, "even in contact with them and blackmailing them with the fate of their families in Ukraine," says a Polish official. Experts inc @Mpolymer @PeterZwack say expulsions curb but don't stop intel operations pic.twitter.com/jbSFy0zztq

— Sasha Ingber (@SashaIngber) April 23, 2022