I can't even get passed 1500 without the mongols loving my stuff up, how does anyone play russia without dying from the hordes and the polish
a bit of luck and some well though-out tactics. starting as Muscovy, I started off with lithuania, golden horde, and novgorod rivaling me. basically what you want to do is;
1a. casus belli on tver and Ryazan. declare on tver and vassalize it. wait on Ryazan.
1b. find an alliance between either denmark, lithuania, or poland. i got lucky and poland got the PU over lith so they werent rivals anymore, and i allied denmark and poland. by now you have two options, you can do in either order.
1a) declare on novgorod, taking land up to the providence novgorod and giving cores back to pskov and tver (if they have no allies)
2a. if livorder has no allies, declare and vassalize them! Later in the game I made them my march, because their tech is godly.
1b. wait until golden horde starts amassing troops on your one border province you can see into (meaning they will attack Ryazan soon)
2b. once golden horde declares on ryazan, declare on ryazan yourself (dont call in allies if you can) and snatch up the two provinces before golden horde does. vassalize them and you'll inherit the war with golden horde. they'll usually not call in any of their allies since ryazan should of been a piece of cake. you can call allies in (i'm pretty sure?) and war, ending the peace deal on feeding as much as you can to ryazan.
congradulations, you now have beaten back both novgorod and the golden horde, and now own your own personal vassal swarm! you'll have too many diplo relations though, so make sure to intergrate pskov and the other one you start with (not perm) cause they'll be useless. you now can fully annex novgorod in a new war or push south and start vassalizing the large land area, yet small armied nations.