@Arthur:
You might as well issue an R1 DoW against Japan; at our gaming group we generally assume that Russia is at war unless stated otherwise. So far I haven’t seen any reason in non-BM games to not opt for immediate war.
This makes perfect sense with experienced players, but I do remember a game where I, playing Russia, managed to delay a Japanese attack for quite a few turns by claiming that we had always been on good terms and that I had never done anything at all to damage Japan’s interests. :-D