What border treaty? I have seen nothing about a recent border treaty. Siberia is, has been and always will be Russian territory.
I should like to add, the border disputes were a joke. The Soviets would have invaded, but to what end? Think about Romania for a moment. I have read very much about the Soviet Union, to the point I know that enigma inside-out. Romania was famous for thumbing its nose at the Soviet Union. Hungary and Czechoslovakia both used to do the same. Yet, Romania was never invaded, but Hungary and Czechoslovakia were. Why is that? Romania was even allowed to keep thumbing their noses at the Soviets, but Hungary and Czechoslovakia were re-invaded. What gives? Simple. Hungary and Czechoslovakia were experimenting with democracy, with removing themselves from communism. This the Soviets could not allow, so they invaded. Romania, however much they thumbed their noses at the Soviet Union, however much they told the Soviets to **** off, the Soviets tolerated this ONLY because no matter how the Romanians acted, or what they did, they were NEVER in danger of becoming non-communist. The Soviets were content to let Romania be assholes to them, as long as they remained communist, and therefore no ideological or military threat to them. This is the same with China. As long as China remained communist, the Soviets would never invade. I should like to remind you that the Soviets ALWAYS came out on top in the border skirmishes. Alas, Russia is no longer communist, so i doubt they will tolerate any hijinks from the Chinese any further.