A Russian armored vehicle on the road between Simferopol and Sevastopol in Crimea earlier this month. Russia annexed the region two weeks ago. Other Russian forces, across the border from Ukraine, may pull back in coming days. Viktor Drachev/AFP/Getty Images hide caption

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President Obama, accompanied by Dutch Prime Minister Mark Rutte, speaks during their joint news conference at the conclusion of the Nuclear Security Summit in The Hague on Tuesday. Pablo Martinez Monsivais/AP hide caption

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Armed men stood atop a chimney near Ukraine's naval headquarters in Sevastopol, Crimea, on Wednesday. They raised Russian flags after taking over much of the facility. Vasily Fedosenko /Reuters /Landov hide caption

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Russian President Vladimir Putin. Mikhail Klimentyev/RIA Novosti/Kremlin pool /EPA/Landov hide caption

toggle caption Mikhail Klimentyev/RIA Novosti/Kremlin pool /EPA/Landov

A masked man, believed to be a Russian soldier, holds a Crimean flag as members of a pro-Russian self-defense unit stand in formation Monday in the regional capital of Simferopol. Vasily Fedosenko /Reuters /Landov hide caption

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Troops under Russian command scream orders to turn back before firing warning shots at the Belbek airbase in Crimea. The troops were reacting to a large group of unarmed Ukrainian troops who approached them. Sean Gallup/Getty Images hide caption

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Russian President Vladimir Putin during his news conference Tuesday. Alexei Nikolsky/AP hide caption

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Though some conservatives said President Obama's alleged weakness led to Russian President Vladimir Putin's Ukraine invasion, reaction didn't follow the usual partisan lines. Mikhail Klimentyev/AP hide caption

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Armed men in military uniform, believed to be Russian soldiers, were outside the territory of a Ukrainian military unit in Bakhchisaray, on the Crimean Peninsula, on Monday. Maxim Shipenkov/EPA/LANDOV hide caption

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