STEPHANIE VAN DEN BERG and ANTHONY DEUTSCH UNITED Nations war crimes judges have upheld a genocide conviction and life sentence against former Bosnian Serb military commander Ratko Mladic, rejecting all grounds of appeal against a lower tribunal's verdict. Mladic, 78, led Bosnian Serb forces during Bosnia's 1992-95 war. He was convicted in 2017 on charges of genocide, crimes against humanity and war crimes including terrorising the civilian population of the Bosnian capital Sarajevo during a 43-month siege, and the killing of more than 8,000 Muslim men and boys in the eastern Bosnian town of Srebrenica in 1995. He had been…