https://www.npr.org/2023/03/22/1165066688/xi-jinping-putin-talks-china-russia-ukraine
Xi told Putin BIG changes are coming and what seems to be in the cards from the Chinese POV, they want the land taken by Russia in 1860 or thereabouts.
That will definitely throw some shyte in the game.
The land taken in the 19th century is rich in natural resources and right now China is paying for those resources like oil and minerals and it sounds like they figure if the take the land back they no longer have to pay anything to Russia for those resources.
Depending on how soon that happens, it could mean trouble for Putin in his Ukraine war and plans for Moldova and other states which used to be in the Soviet empire.
If there is a battle for those lands Russia will be in deep doo doo trying to do a war in Ukraine and defending that Mongolian territory.