If Obama had told Putin to remove his ass from the Crimea or the First Marine Division would do it for him, it would have been resolved immediately.
Russia is incapable of a sustained fight with ANYONE. they are a basket case on the edge of collapse, again. Oil is $56 a barrel, close to or below their cost of extraction for their dirty fuel.
They are also the only country in Europe that has a declining life expectancy coupled with a collapsed birth rate.
I would expect that Putin would take the opportunity to test some of his new weaponry, should that occur within walking distance of the Russian border.