Censor.NET reports citing Bloomberg
Two officials who discussed the sanctions deliberations said that blocking additional Russian banks would be a significant escalation and could create large repercussions, particularly in European economies.
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The most extreme measure under consideration by President Barack Obama's administration is shutting banks out of the Western financial system entirely, two other U.S. officials, who requested anonymity because the policy discussion aren't public, said. They pointed to other intermediate steps that could be imposed before any outright block is considered. Such measures could include restricting additional banking operations in dollars by Russian banks. A more modest move also could help the U.S. stay in step with its European allies, whose economies would bear the brunt of any Russian reaction.
Putting a Russian bank on the U.S. Treasury's "specially designated national" list would be a major escalation of the economic pressure the U.S. is exerting on Russia to stop supporting the separatist rebels who've seized parts of eastern Ukraine. The action would bar U.S. citizens, residents and companies from dealing with the sanctioned banks and allow the U.S government to freeze any assets in American jurisdiction.
The impact, however, would be global. Foreign banks with significant business in U.S. dollars would be reluctant to risk running afoul of the restrictions, just as they were after the U.S. fined France's BNP Paribas SA nearly $9 billion last year for violating sanctions against Iran, Cuba and Sudan.