Xi doesn't do anything unless he gets something in return.
As I have discussed, he wants the reconstruction work and the rebuilding and ownership of the ports in Ukraine. He already owns Russia. Nothing is going to reverse that, so he has nothing to lose by gaining a foothold into Ukraine as well. They want to be able to market themselves as peacemakers around the world. They are ten steps ahead of the Americans and twenty ahead of the Russians.
Meantime Russia is whining...
Xi Jinping is accused of BETRAYING Putin by Russian state TV: Chinese leader's phone call with Zelensky sparks outrage, with propagandist asking 'Are we friends or what?!'
- Russian propagandist accuses Xi of undermining the Kremlin with Zelensky call
- Now asks what Xi was doing 'interrupting Putin's work' during a visit last month