China also has a real economy and they don’t want to lose it. 20% of gdp is exports. 17% is imports. Despite all the nationalism calls for self-reliance, their government debt is very high, they don’t have a youth bulge, a major war with lots of casualties would hugely affect it and challenge the CCP’s doctrine of having restored China to prosperity that it mostly had except for late antiquity, the high Middle Ages when the Mongols took over, end of the Ming and the Manchu conquest, and late 18th through late 20 centuries. A huge amount of casualties would be devastating and the loss of at least Taiwanese money and industry would condemn many parts of China back to rural poverty. Russian doesn’t have that level of myth making. Restore the glory of the Russian Empire? How? The Russian Empire came to power by modernizing and beating another crazy aggressive conquest empire, the Swedish Empire. The USSR main claim to legitimacy was Stalin in his paranoia claimed war with the capitalist west would come, the biggest war ever arrived on his doorstep of a guy killing even more people than he was, and his army won in the end. How can Putin accumulate such glory? Taking over vulnerable chunks of his neighbors like Louis XIV? He did that and all it got Russia was sanctions. Louis failed to take Spain. Putin failed to take one of the poorest large countries in Europe and left thousands of bodies in his wake. Russia’s population has been shrinking for a while, it’s economically weaker than almost all prior Russian state, it decidedly does not have a youth bulge, and the oligarchs got their wealth from stealing it from the people and state rather than through service to the state like Russian feudalism.