I have a master's degree in Asian Studies/Chinese. I learned Mandarin Chinese, lived with Chinese people, was certified by the U.S. Army as a Foreign Area Officer (FAO) for China, served as a military attaché, and traveled to China several times. In other words, I know a thing or two about China and the Chinese.
At the moment, China may be supporting Russia in its war on Ukraine, but make no mistake about Beijing's long-term intentions: If Russia collapses and dissolves (which is not impossible to imagine), the Chinese will very quickly seek to re-acquire the territories the Qing dynasty was forced to surrender to Tsarist Russia. You can absolutely count on that happening.
Back in the 1950s and 1960s, in the days of Stalin, Krushchev, and Mao Zedong, the Soviet Union was far more powerful than agrarian China. Back then, Soviets were clearly the "outer spoon" in that "bromance."
But today? The tables have turned; China is an economic and industrial powerhouse, and it is Russia that has become backward and weakened. Every Chinese school child is taught about the "Century of Humiliation" and the period of "Unequal Treaties."
Unlike Americans and many Westerners, most of whom think about the future in terms of fiscal quarters, the Chinese think in terms of years and decades.
Believe me when I tell you: The Russians KNOW all this. And it scares the 💩 out of them.
This clip with millions of hits in China calls for China to take over Siberia, Lake Baikal, Sakhalin and other parts of Russia after it loses in Ukraine then falls apart.