Russia claims to be the first country with a coronavirus vaccine that's cleared for use, but some scientists aren't so sure.
Russian President Vladimir Putin said one of his daughters has already been given the vaccine.
Putin emphasized that the vaccine went through all of the necessary tests to ensure it's safe.
U.S. scientists have warned rushing to use a vaccine before Phase 3 trials (involving thousands of people) could backfire.
Putin said the vaccine will be voluntary and provides immunity for up to two years.
Photo: Russian President Vladimir Putin chairs a meeting with members of the government via a teleconference call at the Novo-Ogaryovo state residence outside Moscow on August 11, 2020. - Russia has developed the first vaccine offering "sustainable immunity" against the coronavirus, President Vladimir Putin announced on August 11. (Photo by ALEXEY NIKOLSKY/SPUTNIK/AFP via Getty Images)