He didn't actively seek to join German side. Russian peasent led German patrol to his hide out.He turned down the offer to take a plane out:
https://en.wikipedia.org/wiki/Andrey_Vlasov#Defection
He turned down the offer to take a plane out:https://en.wikipedia.org/wiki/Andrey_Vlasov#Defection
Whatever he told Germans afterward is, well questionable, did he do it for survival or because of change in believes?
After all we know how well Germans treaded Soviet POWs and how good they had it in German captivity. Definitely for Germans it was propaganda coup which they... didn't explore properly because of their own flawed ideology.
McArthur didn't refised evacuation and till today even on this forum there are dicussions how he abandoned his soldiers.