Inspired by this:
https://www.alternatehistory.com/Discussion/showthread.php?p=11092418&posted=1#post11092418
https://www.alternatehistory.com/Discussion/showthread.php?p=11092418&posted=1#post11092418
Probably Japan on the side of the allies TL it's been done before in a different form, but in this timeline, let's say Stalin joined the Axis, and there is reproachment between Japan and US, UK etc. How would that go? Would Japan go to war against the USSR? Would they receive lend lease (say the one historically sent to USSR)? What happens to China and rest of Asia in this TL? And what interests me most, what are the effects on the IJN and japanese army and air force, and indeed how does the immediate postwar period looks like in this Japan?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.