It appears that the Russian-oriented Wagner group paramilitaries killed nine Chinese nationals at a gold mine in Chimbolo. Xi has already called for “severe punishment” behind those responsible. This article presents a fairly conclusive assertion that the Wagner group was behind it.
What will President Xi Jinping do about the mass-murderers that Putin apparently supports? He might have to get in line behind other individuals who want Putin arrested.
Witnesses Unravel the Chinese Mass Murder Mystery That Could Ruin Putin (yahoo.com)