towards moscow challenging putin s grip on power. prigozhin stopped after reaching a deal with putin for amnesty that few believed was genuine. a wagner member said the group will continue to operate under new management. we have other commanders who we obey and we will operate further. what s happened has happened. we have to stay together, he said. prigozhin was last seen just days ago somewhere in africa where wagner has interest in gold and diamond mines. it s unclear why he return to moscow and boarded the plane. and richard s joining us mow. do we think we ll ever get an answer about what really happened here, what brought down that plane? reporter: i m not sure if we re going to get a straight answer from russian investigators, especially if the russians were behind this. we spoke to an american airline crash investigator, an expert in this kind of thing, and he said