Tensions are mounting as Russian troops step up their presence in Ukraine's Crimean peninsula and world leaders push for a diplomatic solution to the escalating crisis. As ideological battle lines are drawn around the world over the situation, leaders are painting vastly different pictures of the realities on the ground. Here are some of the questions at play, with a look at how key players are weighing in: Who's in charge of Ukraine? Russia's take: Viktor Yanukovych remains Ukraine's elected leader, and Ukraine's new government is illegitimate. Russian United Nations envoy Vitaly Churkin called it an "armed takeover by radical extremists."
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Key questions are in dispute over the crisis in Ukraine
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Russia, Ukraine disagree about who's in charge
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Ukraine's U.N. envoy says 16,000 Russian troops are in Crimea
@placeholder's take: Ukraine has a legitimate government and is set to have new presidential elections on May 25.