The US in recent weeks has made deals to acquire hundreds of millions of doses of potential Covid-19 vaccines from several companies as part of its Operation Warp Speed programme.
With over 737,000 deaths and more than 2,100,000 Covid-19 infections worldwide, a vaccine for the virus is widely anticipated.
As wealthy nations ensure themselves a sufficient supply of vaccines, there are concerns the hoarding could lead to vaccine nationalism and a shortage for others.
Sinopharm's candidate vaccine is already being tested in the United Arab Emirates with 15,000 volunteers.
Global leaders join World Health Organization to launch an initiative to accelerate work on drugs, tests and vaccines against Covid-19, but US stays away from plan announcement.
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