With Russia still fighting it’s thinly disguised proxy war in Ukraine, other former Soviet states have to be nervous. That’s why Lithuania is reintroducing conscription.
To my mind, all of the Baltic countries should go to a universal service model like Switzerland or Israel: Everyone does a stint in the military, and everyone has an assault rifle at home (with a good smattering of handheld antitank weapons amidst the civilian populace as well).
The Baltic countries should all make it as hard as possible for Russia to occupy any parts of their country. Indeed, I would suggest that right now, disguised Ukrainian special forces units should be attacking critical infrastructure (rail lines, bridges, transmission lines, pipelines, etc.) all across Russia.
Evidence suggests that Putin regards the economic damage being done to Russia by sanctions as an acceptable cost for digesting part of the Ukraine. That cost needs to keep rising to deter both present and future aggression.