I was thinking (if players agree) to have Russia & Japan put 1-2 ipc’s in a NAP fund. Let it grow, and the player that breaks the agreement (with an actual attack) forfeits the NAP fund to the other player. Allow Russia to declare war in name only (no attack) so it can invade neutrals (which is a silly loop hole anyway, Russia should just be allowed to invade neutrals from the get go).
Make a list of things that would be a deal breaker, like Russia in China or UK Pac tt’s, or allied attacks on Jap from Russian land ect…