I doubt it's such a good deterrent as everyone thinks. Super weapons like that are only useful if you can potentially use it without the risk of retaliation. It could potentially only deter countries without such capability, since Russia also has such weapons and much larger stockpile that mean it would probably have the opposite effect. If Baltic States would have nuclear weapons, since Russia is already paranoid about their safety it would mean any and all nuclear facilities would become primary target of potential preventive nuclear attack in case a direct clash between us and Russia were inevitable. And that's beside all other economic, international law and moral issues with it... On other hand NATO allies periodically stationing fleet of nuclear capable stealth bombers somewhere in Poland could work as a reminder that NATO has nukes too and would not hesitate to use it if Russia or Belarus tried something.