That was all very well when wars were conducted with masses of men in armor bearing swords.
However, nowadays, we use heat-seeking laser-guided missiles, and that sort of thing. Whether these masses of men will be of any use remains to be seen. I suppose they could invade Siberia or something like that.
That's what I believe will happen... China's already loosening the border between itself and Russia, and most of the Eastern edge of Siberia has more in common culturally, ethnically, and economically with China than Russia.
One day Putin or Medvedev will wake to the news that 500,000 Chinese troops sit 300 km inside Siberia, which is now annexed because it is "traditionally more Chinese than Russian".
Russia does not have the men or materiel to stop it, nor the need or ability to harvest the natural resources of Siberia. China has the men, the materiel, the need, and the ability.