OK, I’ll start by saying this strategy is played very commonly by one of the top players of the AA42 ladder of GTO (4 times winner). Games are played with UK6 bid that is places in Persia and Trans-Jordania (league rules)
For Germany, he builds a aircraft carrier and a destroyer that he puts in the baltic. The idea is to force UK to build 3 fighters (to counter the fleet and not to lose London on G2). Then assuming UK builds 3 fighters, he’ll remove the Figs and leave the 3 boats in 3 different SZ. The other idea behind that is to send units in Africa while UK is busy killing your boats. This way UK killing the battleship in Med is not happening before UK3 which lets Germany send 8 units in Africa, enough to take many IPC in Africa easily.
On the following turns he’ll build 1 Bom a turn to prevent landings for quite a while with the UK1 turn spent on planes.
Obviously Russia will come pretty deep in Germany stacking even Ukraine or Karelia if they want but they will have to go back because with Japan he build 2 IC on turn 1 followed by all tanks (and Bombers in Tokyo with the extra IPC).
Obviously, I’m summarizing. Going Pacific with US (I’m meaning with no IC in Asia here) as no chance to work (I tried once and got absolutely destroyed). Japan can just ignore US boats and Moscow will fall before they even get near Asia.