Prime Minister David Cameron has said there can be "no excuse" for outside military intervention in Ukraine.
Of course Russia has an interest in what happens in the Ukraine, and the United States may have an interest but no excuse for intervening in the process. Obama threatening is an abuse of US power and influence.
The British Prime Minister talked about military intervention, which is obvious. Check a map and tell me how the US or Britain could effectively intervene, unless it airlifted a limited amount of supplies.
I just think Obama's statement is an indication of national arrogance.