- Xi is frustrated that Putin won't seek peace in Ukraine, reports say.
- China has touted a 12-point peace plan for Ukraine that Russia hasn't pursued.
- China recently attended a peace summit in Saudi Arabia that was described by Russia as "doomed to fail."
China's leader, Xi Jinping, has been Russian President Vladimir Putin's most important international backer amid the war in Ukraine, with the authoritarian leaders declaring a "no limits" partnership from the outset of the conflict.