US Treasury Secretary Janet Yellen stressed on Sunday while speaking during a trip to India, that ending the war in Ukraine is not only "first and foremost a moral imperative" but also "the single best thing we can do for the global economy."

Janet Yellen once touted the benefits of a weaker greenback for exports, but as the incoming treasury secretary, she faces pressure to return the U.S. to a "strong-dollar" policy -- and may cause trembles on Wall Street if she doesn't.