Oliver Bullough, the British author of "Moneyland" (a good read) and several books on modern Russia, tweets the story of his uncle on D-Day landing on a beach defended by Ukrainians. Who all immediately surrendered.
Some capitulated forthwith like Bullough's Ukrainians. Some others were hardcore and fought bitterly as they feared a death sentence if returned to Stalin.
Steemit blogger 'Alber159357' put up a good post two years ago about Koreans at Normandy. They had fought for the Kwantung Army at Khalkin Gol, then they had fought for the Red Army at Stalingrad &/or Kursk, and finally for the Wehrmacht at Normandy.