It began with this...
http://www.nytimes.com/2010/04/06/world/06arms.html?pagewanted=all&_r=0
http://www.americanthinker.com/articles/2011/09/would_obama_retaliate_against_a_nuclear_attack.html
Your links don’t even come close to what you claimed and his statement was about not using nuclear weapons against non-nuclear powers that use bio or chemical weapons.
So tell me again why you think Putin wants to commit suicide by just suddenly deciding to end it all by attacking the nuclear NATO powers of the U.S. France and Great Britain, and face the conventional forces of all 28 of our nations?