The correct answer is - Eurasian and North American plates.
The Eurasian tectonic plate and the North American tectonic plate meet at the far east of Russia. In fact, the easternmost part of Russia actually belongs to the North American tectonic plate, and the boundary between these two plates is on land, not on water, like the political boundary between them. Because of this boundary, in the eastern part of Russia there's highlands that have formed because of the pressure, as the North American plate is moving slowly towards the Eurasian plate.