Is military conflict in Ukraine completely out of question??
Rational observers would not believe military conflict in Ukriane is likely because it does no good to both Russia and EU/US sides.
However, rational observers should also noticed that the violent conflicts in Kiev climaxed during the Winter Olympic games. The timing could be well planned, and some international operatives might have participated in the armed protest.
Then what could prevent them provoke a military response from Russian, such as a shootdown of war plane to escalate things further?
These events are not purely random.
Kerry is playing chicken, for now. I think that he was told to change some of his rhetoric to calm the stock market. Maybe some hedge funds are about to go bust. Nobody really had expected them to carry this minor issue to this far.
But unexpected things can happen over the weekend so that his inner "eagle" might be invoked. ;-))