Not in the Bear's interest. Dragons, after all, do eat Bears.
Russia and China fought a border war in 1969. Skirmish, really, not a full-on war. China still claims an area the size of Alaska along the Amur-Ussuri rivers, and that area is listed on Chinese maps has having been taken by "unjust and unequal treaty" during the time of the Czars and the Mandarins.
So they signed a 50-year "Treaty of Friendship" (how appropriately communist, eh?) with China. Guess the solved it, eh? Methinks we need a similar treaty with Canada...oh, wait, REAL friends don't need to affirm their relational status via a signed document, now, do they? It's "peace in our time" Soviet-style.
The Dragon has been biding its time, building, stealing tech from Russia and the USA and Europe and Japan and...ad nauseam.
Russia is going to lose Siberia. Everything East of the Urals. Everyone knows this, especially the Russians. Russian young people have been leaving Siberia in droves for decades, now, further underpopulating that region.
Chinese poachers are all over Lake Baikal. Russian game wardens can't keep up.
Chinese immigrant communities--one, in it was either Irkutsk or Novosibirsk--actually set up their own telephone exchange atop the Russian one. It was only discovered as Russian crews performed maintenance on their lines, they traced the other ones and found the immigrant community had made their own phone exchange using the structure of the Russian one (and pocketed the money, of course). How very stereotypically innovatively and deviously Chinese of 'em! (Gotta love that!)
No, let Russia turn East, and get Eaten.
Sauron
God help us.