Business Insider says 97% of the Russian army is now committed to Ukraine.[1] That leaves the central Russian government very vulnerable to its own internal separatist movements, of which there are rather a lot.[2]. Some of those movements are in areas landlocked or not economically viable, but the Free Ingria movement (Leningrad oblast, including St. Petersburg) has potential. That area is bordered by Finland, Eston…
No, it's a toy movement.
> There's no part of Russia bordering Ukraine that Ukraine could take as a bargaining chip
Transnistria could play precisely that role.