Tens of thousands of mercenaries are fighting for Russia in Ukraine.
The so-called Wagner Group has been heavily involved in the country’s efforts to capture the Ukrainian city of Bakhmut.
At the head of the group is Yevgeny Prigozhin, a former hotdog salesman-turned-mercenary leader who now has a private army of Russian convicts at his service.
The BBC’s Analysis Editor Ros Atkins explains his rise to power.
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