Washington, which accuses Moscow of being the driving force behind pro-Moscow separatist unrest in eastern Ukraine, slapped the toughest sanctions yet on Russia on Wednesday.
"It is widely known that sanctions are a double-edged sword," the ministry said in a statement, adding it reserved the right to introduce retaliatory measures.
"Of course, these sanctions are inappropriate and of course they do not correspond to the spirit or the legal standards of existing international relations, in particular in the field of finance and banking," Andrei Kostin, whose bank is Russia's second largest, was quoted as saying by Itar-Tass news agency.
"I believe that if we do not take measures to stop such unilateral actions, we could see devastating consequences for the global financial system." REUTERS