Further but Japan clearly demonstrates that being in the Axis does not mean being in the war. The Japanese waited until they were quite sure that the advantages of peace were outweighed by the necessity of war and they got that calculation wrong clearly.
Given the shift in alliances then it is going to be very tempting to approach America for access to Lend Lease to go fight the Soviets...the Army wants to just fight someone and make the kind of career and personal loot type gains that the officer corps had grown used to. One enemy was as good as another while for the Navy not fighting the British and Americans is a dream come true. For those ministers with an actual eye on the economy then good relations with the US and peaceful access to the markets of the British Empire are also going to be attractive.