Sure - if they have some bank that isn't sanctioned (AFAIK there are 0 domestic banks not sanctioned) - or money already outside of Russia (only the rich, and most of the mega rich are sanctioned individually).
Unfortunately no. Gazprombank, Raiffeisenbank and Rosselkhozbank are partially sanctioned but operational - they allow to do swift transfers, their own native transfers to select post-soviet countries and their unionpay cards work relatively well outside of russia.