Same when i sold crap units to Japan from Germany, and i know Japan/Germany have no at war against other nations yet, still neutrals can shoot them down of transports by sea...
I checked who "most kill" of list, it was UK, sure superme warships...
I found why and Japan are NOT at war with UK:
In Singapore of UK warships open shoot against all sea transports and killed, reason transports moved in Singapores sea zone, guess it is why UK warships killed all transports ^^
Sea transports should move a little more south as neutral sea zone, more safe. Since i deal with Japan as sight, I can look transports to move, and found out why
The UK warship called "CAP Terror", i wonder it was fun for BG team?