What Putin says and what he does are 2 different things. He will simply wait and watch as Obama's position weakens over the next 2 years as his foreign policy credibility continues to crater.
Beware the man who would rule you for your own good. He will never cease. He will regulate every aspect of your life, destroy your liberty and enslave you, and sleep well convinced that he has made the world a better place.
The assassination of Boris Nemstov adds to the downward spiral.
The NATO agreement makes any moves within NATO countries our business. So, it's entirely possible that Putin extends his ambition to include the baltic states, at which point we wouldn't have a choice. I seriously doubt Putin would be that foolish, but it's certainly a possibility, and a real enough one to encourage leaders of those states to ask for NATO to step up their presence within their borders.