Truth be told too, Russia is a country with a lot of land but most of it inhospital. They have been decreasing in pop since the 1990s. Ignoring Ukraine is to give the soviets a breadbasket and resources to once again become a real threat. Stop then in Ukraine and Russia will die off on its own accord. China is the bigger problem, but enemies are must easier to handle when you don't ignore them. Ignore Russia and the future would have a united RU and CH front that would make WW2 pale in comparison. Kick their ass now, and China stands alone, containable, with a possibility that things never come down to a contest of arms.