DEMOCRATIC Republic of Congo's President Felix Antoine Tshisekedi was officially nominated as a candidate for the December 20 presidential election by his ruling political coalition the Sacred Union. Tshisekedi is seeking a second term in the vast nation, which is the world's top cobalt supplier and No. 3 copper producer, after winning a disputed first term in a 2018 vote. His rule has been mired by economic hardship, the COVID-19 pandemic, Ebola outbreaks and persistent insecurity, particularly in the east where the resurgent M23 rebel group seized swathes of territory leading to a breakdown of relations with neighbouring Rwanda. On…