(Reuters) - Days after his ally Viktor Yanukovich was ousted as Ukraine's leader, Russian President Vladimir Putin ordered a 150,000 troop Russian military exercise on Ukraine's border. The fall of Yanukovich - and Putin's potential response to it - has reignited a debate in Washington on how to respond to the assertive Russian leader.
For Obama administration officials, Vladimir Putin is a concern but not a threat. Any talk of renewed Cold War-like Russian-American rivalry, they say, is reckless and counterproductive.