The US flew their Open Skies mission over Russia on the 21st April.
http://www.foxnews.com/politics/2014/04/22/us-conducts-spy-flight-over-russia-after-delay/
Yes, well, thats likely why Putin has cut off all telephone contact with the White House. They saw what he was up to.Meanwhile its crickets at the White Hut.
We all know how this ends up, Obama is pressured to act and then he will finally send a completely unprepared force of our soldiers over to the Ukraine , ill equipped, with horrible ROEs, with no clear objective, and our soldiers will be put right into a liberal meat grinder wjhere the Russians prevail. Clinton did it in Somalia ( no tanks for the Marines there although they begged for them), Carter in Iran ( a hastily organized fiasco with no regard for conditions on the ground), and Johnston in Vietnam ( limited ROE when the war could have been won.).
Watch Obama be true to that pattern, only a whole lot worse.