Pay no attention to them. Stay in the valleys and position yourself so they can't hit you. When that cap zone becomes active, move up. There's little incentive to drive 10 minutes to kill someone who has almost no impact on the battle-at-hand.
i found myself many times looking to the north and noticing russian tanks coming out of their spawnzones behind me!
so i rotated my tank and started shooting them in the back, and taking them all out.
i didn't do anything on purpous, i was positioned to the north with 3 other tanks and we came from the south. when i saw russian tanks coming out behind us.
this might be when one side of the map is capped and the other one isnt,