HeavyWeaponsGuy
Banned
Well, the Soviets in OTL were strong advocates of a collective security agreement in East Asia (as they were in Europe). So I could see a push in OTL as well.
Are you talking about with Japan or with other states with whom they want to cooperate?
Honestly though Stalin would work with Japan as a mere means to an end so he can build up his forces and crush them, he tended to be good at following treaties, Japan tended to be good at breaking them. Japan itself probably wasn't going to entertain the sorts of prerequisites (i.e. stay out of China) that the Soviets would want in exchange for their cooperation.
Once Japan goes into China it's liable that the Soviets are going to get rid of them.