Probably Otto Wille Kuusinen. A Finnish communist who fled to Soviet Union after the Finnish Civil War, and whose major accomplishment was to be one of the few Finnish exiles in Soviet Union who were not murdered in Stalin's purges. During the Winter War, Stalin appointed him as the leader of so called Terijoki government, which proclaimed itself the government of Finland and appealed to Soviet Union for "help". Part of Soviet Union's casus belli was "aiding the Terijoki government". Due to Winter War not ending in occupation of Finland, the Terijoki government never fulfilled it's purpose as Finland's new communist regime, and it was disbanded in 1940. Kuusinen was able to continue work in Stalin's administration, and afterwards seamlessly became a Khrushchev sycophant, living rest of his life as a wealthy man in Soviet Union. He would have wanted to return to Finland and re-enter politics there after WW2 but was not allowed to, because the Party thought that he would be too polarizing and destabilizing figure in his homeland and they already had enough commie and pro-commie stooges there.