A Russian activist and volunteer who had helped Ukrainian refugees return home during the invasion has died in police custody in the southwestern Russian city of Belgorod, the Vot Tak news outlet reported Monday, citing two anonymous sources in his inner circle. Alexander Demidenko, 61, was reportedly abducted and tortured in October 2023. After serving 10 days in jail on misdemeanor charges of public alcohol consumption, he was placed in pre-trial detention for alleged illegal weapons possession. According to Vot Tak, Demidenko died inside a Belgorod detention center on Friday. The investigat…