Japan, having intervened to prop its weakening currency to little effect in the past, roped in the U.S. to stage a coordinated intervention.

Japan and the U.S. may unveil a joint policy next week to defend the yen after record interventions in April and May.

The U.S. and Japan are said to have jointly intervened to prop up the Japanese yen for the first time in nearly 30 years after the currency plunged to its...

Tokyo and Washington saw eye to eye on halting yen weakness