The degree of coordination between the two countries now appears to be the tightest in decades, which has raised the stakes for traders betting against the yen.

NEW YORK, July 30 : The Japanese yen surged on Thursday, in a move analysts said bore the hallmarks of official intervention by Tokyo to prop up a currency that has slumped to…

The Japanese yen recorded its strongest one-day gain against the U.S. dollar in nearly two years after suspected intervention by Japanese authorities. The move adds to a long…