Washington is weighing an array of economic weapons to penalize Russia for its armed intervention in Ukraine, from asset freezes to expelling Moscow from the G8 group of states, but may find Europe more reluctant to resort quickly to sanctions. British Prime Minister David Cameron, reflecting the U.S. line, has warned Russia it will pay 'significant costs' unless it changes course. But an official document unwittingly exposed to a photographer's lens suggested London opposed trade sanctions and shutting its financial capital to Russians. U.S. President Barack Obama, acknowledging the fast developing nature of the situation, needs Europe to join it to make sanctions tough enough to potentially deter Russian President Vladimir Putin. He is focusing first on measures that would not require congressional action and is seriously considering an executive order imposing asset freezes and visa bans on Russian officials, a U.S. official said on Monday. Such an order could be drawn narrowly
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