It is a philosophical question about "how common this is" and I cannot make legal estimation this way: all people are different, for someone marriage is needed for citizenship and material comforts, someone has other meaning about family and marriage. \nAbout legal side of this issue: your marriage can be dissolved both is the USA and in Russia. In case you will decide to divorce in Russia, I can participate in this proceedings in court and in ZAGS (full cycle until you receive you divorce certificate). \nBecause your common place of residence is the USA, assets should be divided under law of your country. Russian court doesn't have the jurisdiction for assets in your situation. \nBest regards, \nKarina Krasnova, attorney at law