Fifty of Afghanistan's 370 districts have fallen to Taliban militants since May, according to the UN's special envoy on Afghanistan Deborah Lyons, as the United States continues its military withdrawal from the country.

Tokyo 2020 announced on Monday that it will allow spectators at the Olympics this year amid the pandemic, setting a 50% cap at venues, up to a maximum of 10,000 people.

The United States is more than tripling its vaccine allocation to Taiwan, as the island battles a Covid-19 outbreak and resists pressure from Beijing to take China's homegrown inoculations.

More than 350 doctors and medical workers have caught Covid-19 in Indonesia despite being vaccinated with Sinovac, officials said, as concerns grow about the efficacy of some vaccines against more infectious variants.