The U.S. dollar slid from above 163 yen to around 156 after Washington and Tokyo confirmed joint intervention.Japan is trying to curb the yen’s inflationary weakness, while the U.S. also sees economic and trade benefits.Tokyo plans to use the Fed’s FIMA repo facility, avoiding Treasury sales that could disrupt U.S. funding markets.The U.S.-Japan rate gap remains intact, meaning pressure on the yen could return despite the intervention.