It has to be the UK. They spend $10B more a year for one. Their military is a full military with equipment and training on all aspects of war, not just defense of the home island.
...but its getting closer and Japan probably has a higher ceiling if the たわごと hits the fan.
I'm not so sure, yes Japan can create a greater army than UK, but the primary difference is that UK is a position where they can focus on projecting power (who's going to attack UK; France or Germany?). Japan on the other hand with its large hostile neighbour, always have to focus on defending the homeland. UK even if USA hanged them out to dry, could always expect some support from its European neighbours (unless they really did something stupid). While even Japan's regional "friends" hate them.
Poll
