Does Obama really mean this?

Thus, speaketh the President of the U.S.:

http://www.theguardian.com/world/2014/jun/03/obama-ukraine-military-assurances-eastern-europe

At its ultimate point of logic, he is saying he is willing to go into a nuclear war for the sake of Europe.

The question that immediately comes to mind is this:

Do you think Obama has the stuff it takes to be a U.S. war president?

Lesson 1:
Do you think Europe is willing to be a reduced to a field of nuclear detritus after the nuclear missile exchanges have been completed between Putin and Obama?

Lesson 2:
Does it sit comfortably with the survivors of a wasted Europe to know that the rest of vast Siberia to the Pacific is left intact?

Lesson 3.
China can finally reclaim all those lands taken from her by Czarist Russia.