There are many reasons why China may not be in a hurry to see Russia's war in Ukraine end

President Joe Biden's trip to mark the anniversary of the war in Ukraine is highlighting an even more grave challenge -- a new era of simultaneous and sometimes intertwined US confrontations with nuclear rivals Russia and China.

source https://www.cnn.com/2023/02/21/politics/president-biden-vladmir-putin-china-ukraine/index.html