Vladimir Putin

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Russian President Vladimir Putin, left, speaks to Tatarstan regional leader Rustam Minnikhanov, back to camera, during a meeting at the Novo-Ogaryovo residence outside Moscow, Russia, Tuesday, April 1, 2014. Minnikhanov, who visited Crimea to attend a congress of Crimean Tatars, discussed their demands with Putin. (AP Photo/RIA-Novosti, Mikhail Klimentyev, Presidential Press Service)

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Russian President Vladimir Putin is already adjusting the subsidized gas prices sold to Ukraine to market levels, one analyst said. (Associated Press)

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Russian President Vladimir Putin, right, and Finnish President Sauli Niinisto take part in a friendly ice hockey match in Igora resort near in St. Petersburg, Russia, Friday, June 22, 2012. (AP Photo/RIA-Novosti, Alexei Nikolsky, Presidential Press Service)

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Sens. Kelly Ayotte, John McCain and Lindsey Graham say breathing new life into the Bush-era missile defense system — particularly by pursuing a "third site" in the Czech Republic — would be an effective way to punish Russian President Vladimir Putin for his use of military force to effect a swift annexation of Ukraine's Crimean Peninsula. (Associated Press)

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Russian President Vladimir Putin, right, listens to Chairman of the IOC Coordination Commission for Sochi 2014 Jean-Claude Killy during a Council of Physical Fitness and Sports in the Kremlin in Moscow, Russia, Monday, March 24, 2014. (AP Photo/RIA-Novosti, Alexei Nikolsky, Presidential Press Service)