Full kill japan first.
uk1 buy all infs. If you can merge your fleet off gibraltar, do it. If not, get that fleet for japan.
Just be a super japan hater. it still takes a few rounds before italy causes havoc in the middle east / africa sector. after the sea lion threat has passed you can put 3 inf or mech a turn in union. After things go well against japan you can have uk pacific act as a second russia shoving units in the middle east.
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Or you can do a ship stuff to europe early strategy. Goal can be to take Norway and cut germany off of his NO.
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You can do a balanced strategy in which everything matters, middle east, russia, pacific.
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imo the easiest strategy to work with is, FULL MIGHT OF AMERICA IN THE PACIFIC. Only when you are not at war do you put stuff in the atlantic (because 3 limit on west usa). Those atlantic pieces are just there to support uk london.