Market Why the US Is Stepping In to Prop Up Japan’s Yen 2 hours ago Financial News The Japanese yen is so weak that even the US has stepped in to prop up the currency. The joint US-Japan action, the first in 15 years, underscores their unprecedented determination to defend the Asian currency. Mia Glass explains why. Post navigation Previous LIVE: Breaking News and Top Stories on CBS News 24/7Next LIVE: Wildfire smoke rises in Greece