I used to be one of the most anti-Russia types because of Qing unequal treaties. Now I am Russian-tolerant, because I realize to recover Manchuria may take a nuclear exchange, the land is quite shitty and unfertile, and China isn't going to be a sick man of Asia anytime soon to be backstabbed by Russia (US is by far the biggest enemy), and future generations can recover Sea of Japan access in due time, the current struggle is with US now, not some hypothetical land recovery 200-1000 years in future. So beggars can't be choosers, anti-US partners is needed now as US is by far the biggest threat now, and Russia is too small to threaten China (unless China collapse again, unlikely for foreseeable future). That is to say, China won't forget unequal treaties, but is not stupid to dwell on history at cost of geopolitical advantage, esp. since the border is largely "settled" as far as PRC concern and claims withdrawn.