The negative of the UK declaring war on Japan is that the US WILL NOT enter the war until Japan attacks, or end of Round 3 (after their turn). This means that Japan can then attack all UK/ANZAC/Dutch territories without fear of brining the US into the war. And they can still collect their +10 NO if they haven’t taken FIC yet.
Perfectly said. Honestly I don’t recommend declaring war on Japan as UK unless you can kill something expensive, or stack Yunnan.
Yeah, in one game UK/India thought it would be a good idea to declare war on Japan round 1. By the time the US was in the war, Japan had the DEI and Calcutta, UK India was nearly extinct and ANZAC had no navy left.