Both sides have nukes, so besides border skirmishes nothing will come of a bunch of people watching a TikTok post.
A big miscalculation. China may assume that Russia would never go nuclear to defend remote territory, or similar miscalculation. Chinese-Russian tension certainly plays to the United States and the West's advantage. It's best to sit back and eat popcorn.
TikTok is Chinese state media. Xi is sending a message to Putin.