Why do you think there "ought to be none [security threat by Russia]" when Putin repeatedly laments the collapse of Soviet Union as the "the greatest geopolitical catastrophe of the 20th century"? I don't see any basis where it can credibly asserted that Russia "ought not be" a security concern when it's leader openly waxes about the loss of Soviet territories. I think given the fresh memories of Soviet domination, Putin the Great's desire for glory, it is not unreasonable to seek nuclear weapons or defensive alliances. Some members dismiss Ukraine as merely a 'US puppet' incapable of independent thought, but I think the fresh memories of Soviet domination and Putin's musing about former glory can easily justify joining defensive alliances. Afterall, Russia's weakness is only temporary, not permanent.
