Information about Renewal of expired visa due to COVID-19.

I am Dr.Zerihun Abegaz, first of i would like to thank for your response. you request me type of visa we are Government official our program is which was canceled due to COVID-19 were for GMP inspection of 2 pharmaceutical industries in China. last time we were submitting all document to your Embassy office in Addis Ababa and we were receive Visa. but our Journey were canceled so what do you advice should we bring again the invitation or can we use the previous one which we submit to your office. now is flight allowed to Beijing and Chengdu? can we start to renew our visa to use it. waiting for your response.