Well.... There's 2 exceptions... Steven Seagal and Snowden...
But only because Russia knows we absolutely wont negotiate for Seagal, they can keep him... and we'd just arrest Snowden, so we're not exactly going out of our way to get him back.
Those 2 people who are technically still Americans are pretty safe in Russia from diplomatic/political based retaliatory prosecutions... Literally any other person even those holding US and Russia passports are vulnerable.