Federal reserve will not and cannot rescue Japan. This is the reason majority of US energy exports are going to Europa. US will have to put its own money on table to defend Eastern EU even in poorest states like Romania.The purpose of interest rates isn’t suppose to rescue the Yen. It’s to keep themselves from plunging off the cliff which is why the UK and EU are hiking unlike the Japanese. Only the Federal Reserve can rescue them (or anyone else for that matter) by lowering interest rates and thus weakening the dollar.
Japan make alot of noise but ultimately it has to deliver products and services that are needed in Middleast/ Europe in addition to US. complete solutions are preferable.