President Barack Obama will sign a bill imposing new Russian sanctions despite reservations, the White House has announced.
The bill – which primarily sanctions Russia’s defense industries – passed with overwhelming support in Congress.
White House spokesman Josh Earnest said the bill sent “a confusing message to our allies” but President Barack Obama will sign it because it “preserves flexibility”.
The currency went into free-fall in trading on December 16.
The bill would also give Barack Obama the authority to provide lethal and non-lethal military assistance to Ukraine, but not require him to do so.
The US and European powers have sanctioned Russia previously over the country’s annexation of Crimea and its support for separatists in eastern Ukraine.
Secretary of State John Kerry, who met Russia’s foreign minister in Rome, said: “These sanctions could be lifted in a matter of weeks or days, depending on the choices that President Putin takes.”
However, John Kerry said Russia had made “constructive” moves in recent days.
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