Very interesting concept, though it would be an extremely dangerous move on his part. What I have been wondering is why this Ukraine thing is dragging on for so long. It is clear that neither the US or NATO is going to stop Russia from taking as much of Ukraine that they want, up to and including the entire country, so why not just get it over with?
If I were Latvia/Lithuania/Estonia, I’d be nervous being between the Russian mainland and that little piece of Russian territory next to Lithuania. Maybe Russia wants a land bridge to that territory? The many ethnic Russians in the Baltics give him an edge if he pursues that route.