Russian health authorities are preparing to start a mass vaccination campaign against coronavirus in October, the health minister has said.
Russian media quoted Mikhail Murashko as saying that doctors and teachers would be the first to receive the vaccine.
Reuters, citing anonymous sources, said Russia's first potential vaccine would be approved by regulators this month.
However, some experts are concerned at Russia's fast-track approach.
On Friday, the leading infectious disease expert in the US, Dr Anthony Fauci, said he hoped that Russia - and China - were "actually testing the vaccine" before administering them to anyone.
Dr Fauci has said that the US should have a "safe and effective" vaccine by the end of this year.
"I do not believe that there will be vaccines so far ahead of us that we will have to depend on other countries to get us vaccines," he told US lawmakers.
