Adm.A.V.Kolchak is of Romanian,or,rather,Moldovan descent,true,but since his last name is Tatar,his ancestors must have moved to Moldova long before,probably part of Tatar mersaneries.
"...Let us not overlook certain noblemen we always will consider as the best, noblest people of Russia: Gavriil Derjavin, direct descendant of Narbek dynasty; Leon Tolstoy, direct descendant of Idris dynasty; Fedor Dostoevskiy of the Cheleby dynasty; Alexander Kuprin, Tugan- Baranovski, and Anna Ahmatova of the Chagoday dynasty. The very last names of these people speak for them: there were Aksakov (meaning, "limping" in Turkic); Kutuzov (from Khuduz, meaning, "mad"); and Kolchak (from Kholchakh, meaning, "glove")."""...
Crimean Tatars, an article by Vladimir Polyakov
Most Ukrainians came to the Island after WW2.The official NKVD term was "Bandery"(from S.Bandera),but it would include any collaborators,nationalists and even AK people.The standart sentence was 8 years of labor camps on Kolima followed by life exile/settlement on Russian Far East.Sakhalin Island was reserved for the worst of the worst "offenders"