AFRICAN MIRROR REPORTER DAVID Mabuza, the South African Deputy President, has flown to Russia for specialised treatment for an undisclosed illness, his office has announced. In a statement, his office said Mabuza, who had requested and was granted leave by President Cyril Ramaphosa.   “During this time, the Deputy President will undertake a visit to the Russian Federation for a scheduled medical consultation. This consultation is a follow-up to previous medical consultations that the Deputy President received from the Russian Federation,” the office said in a statement. The office said the Deputy President will continue with the responsibilities that have been…