Who are the Wagner Group's mercenaries?
"Wagner almost certainly now commands 50,000 fighters in Ukraine and has become a key component of the Ukraine campaign," according to the UK Ministry of Defence. เกมบาคาร่า
It says the organisation started recruiting in large numbers last year because Russia had trouble finding people for the regular army.
About 80% of its troops in Ukraine have been drawn from prisons, according to the US National Security Council.
Before Russia's invasion of Ukraine, it is thought the Wagner Group had only about 5,000 fighters.
They were mostly experienced former soldiers - many of them from Russia's elite regiments and special forces.