Crimea is simply not a critical NATO strategic issue.If Russia were to actually begin a conflict with a NATO member, there would be war and Russia would lose. The next big crisis will come if and when the Ukraine applies for NATO membership. If the West agrees to take Ukraine into NATO, then there will one day be a horrible war.
They can take Estonia (and they will if “western” leaders go on with their impotence) within 24h, NATO will not even release a press statement before it's all over and then goes “but we shouldn't start WW3 over that” crowd fueled up by FSB agents. There are no plans to defend Baltic states in case of invasion, not even plans. Fix it immediately or shut it down.