Well, what about escalating the Russian-Manchu Border conflict? Say if it breaks out into a full blown war, the Tsardom would have no choice but to participate in the escalating border conflict.
Can't be done. Russia was only able to send 2k men IOTL and I bet they could not spare more at the time. I say the 1680s or 1690s can Russia have a prayer; even then we would need an expert on Russian geography and history. I suppose an escalation could be the PoD to swing Russia's interests, but it will never be more than a slightly softer Russian defeat.
