Victoria Nuland, the U.S. assistant secretary of state, lights a candle in St. Michael Cathedral in Kiev, Ukraine, on Thursday. Her comments during a leaked phone call have sparked a diplomatic row. AP hide caption

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AP

Ukrainian President Viktor Yanukovich greets Victoria Nuland, the U.S. assistant secretary of state for European and Eurasian affairs, in Kiev, Ukraine, on Thursday. In a tape posted on YouTube on Thursday, Nuland can be heard discussing the merits of various Ukrainian opposition leaders and disparaging the EU. Mykhailo Markiv / Pool/EPA/LANDOV hide caption

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Mykhailo Markiv / Pool/EPA/LANDOV