Japan and the United States Aug. 3 said they were ready to act again following their first joint action in 28 years to boost the yen, after the beleaguered currency hit a four-decade low.

Coordination between Japan and the United States now appears to be the tightest in decades, fuelling one of the most notable rebounds since the yen began its years-long slide.

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