Relations between Zimbabwe and Zambia have become strained as supporters of President Hichilema Hakainde's United Party for National Development (UPND) denounced Zimbabwe's ruling Zanu-PF during the reopening of the Kongola copper mines in Chingola and Chililabombwe in the Copperbelt province. Videos circulating on social media show UPND supporters accusing Zanu-PF officials, including Patrick Chinamasa, of…