SDR

The SDR, carried out by former Labour Defence Sectary Lord Robertson, found the UK's armed forces are "not currently equipped" to fight opponents like Russia or China, with inadequate stockpiles of weapons, poor recruitment and crumbling morale.

"After so much hype, the SDR is a damp squib," he said.

Patent and Trademark Office for “Sunday Red” or “SDR.”

But Yellen, who manages the United States' controlling share in the Fund, rejected the idea of a new SDR allocation as inappropriate, saying that more existing SDR reserves needed to be loaned to poorer countries first.

The United States has not contributed any of its $101.5 billion share of the SDR allocation to the trust funds, a move that would require approval from Congress.