No details are given, but the Wagner Group has been active in Ukraine for many years. Apparently a private mercenary company, it has been developed repeatedly alongside Russian forces. He has been accused of war crimes in Ukraine, Syria and elsewhere, and Vladimir Putin is believed to be using it to divert official Russian forces from his most extreme actions and to provide reasonable denial. Eyewitness accounts from Bucha described how Russian tactics became more brutal when young soldiers who took part in the first battles in the city were replaced by new units. It is believed that this could be evidence of a deliberate strategy of using special units to sow terror by targeting civilians. Some witnesses described the newcomers as Chechens. The scale of the killings in Bukha came to light last weekend when Russian forces withdrew, leaving the streets littered with civilian bodies. The BND has more disturbing recordings of radio interceptions that appear to show further Russian atrocities in other locations that have not yet appeared, according to the report. The intelligence service analyzes the recordings to determine the whereabouts of the murders they describe. Some believe it suggests that similar war crimes may have been committed in and around the besieged city of Mariupol. The port city on the Sea of Azov has seen some of the heaviest Russian bombing of the war.