(FILES) This file photo taken on September 24, 2020 shows a staff member checking vaccines during a media tour of a new factory built to produce a COVID-19 coronavirus vaccine at Sinovac, one of 11 Chinese companies approved to carry out clinical trials of potential coronavirus vaccines, in Beijing. – China has launched a global charm offensive promising poorer nations priority access to its coronavirus vaccines in a bid to repair an international image tarnished by the pandemic. (Photo by WANG Zhao / AFP)