Yeah, I've found AUM very annoying to fight against, especially if they all just rush your line of battle.
Like katank said, use a lot of arbalests and mounted archers/x-bows and finish them off with Boyars.
I'm also playing a Russian campaign at the moment (high, expert) and I have to say the Russians get a simple, but very efficient roster. I tend to use a lot of halberdiers even against enemy swords. If you keep them supported, they usually get the job done. FFK (druzhina) should be able to hold their own against any sword units. Russians start with a high-command prince, and if you beat the Mongols, you should end up with a high-influence prince, a lot of high valour units and generals with more stars on their chest than the veterans of Stalingrad.
On another note, I don't understand why everybody whines about Lithuanian Cavalry. I've used them quite a lot, and IMHO they are an excellent medium cavalry unit, capable of slugging it out for a while and quickly chasing routers.
Marquis
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