Secretary of State John Kerry is in Kiev, where he's hoping to shore up the weak post-revolutionary government with $1 billion in loan guarantees. About 16,000 Russian troops are believed to remain in Crimea, prompting U.S. officials to threaten Moscow with economic sanctions. Republicans criticized President Barack Obama's handling of the crisis, with Sen. John McCain, R-Ariz., accusing the president of "a fundamental misreading of Vladimir Putin and his intentions."

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