[watchfirst9]

Putin already promised to return the land. Don't need to put a wedge.  

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Putin never said it. 

https://baijiahao.baidu.com/s?id=1730057904425745189&wfr=spider&for=pc
Cn foreign ministry already replied
外交部发言人赵立坚明确指出，中俄双方明确表示已经彻底解决历史遗留的边界问题，互不存在领土要求，双方将致力于将两国共同边界打造成永久和平，世代友好的纽带。

They will not revisit old claims as they consider their borders with Rus Fed settled. 
I expect PRC govt to honor their treaty and not behave like Ind, who keep revisit 
lines they agreed when discuss unresolved sections.
Cn has settled all land borders with their neigbours except Bhu and Ind. 

Do not trust too much on ytubers or western media news as is unofficial.