Russian mercenaries are fighting worldwide in crisis-torn regions like Syria, Ukraine and Libya. They’re part of the private military company known as the "Wagner Group". But what is the Wagner Group - and who is pulling the strings? In Libya, it’s thought that Wagner mercenaries have been actively involved in armed engagements since 2019, in the service of General Khalifa Haftar. Wagner operatives are also blamed for numerous war crimes. But often, there are no witnesses to their activities. UN observers say thousands of Wagner fighters are currently deployed to conflict zones outside Russia. Two BBC journalists established contact with two former operatives and interviewed them about their time with the paramilitary organization. In the documentary, they report on the mercenary group’s operations and what motivates members to join in the first place.