Moscow’s decision to grant approval Coronavirus vaccine before final trials have been completed has raised concerns among some experts, Reuters report.

German Health Minister Jens Spahn said Russia’s COVID-19 vaccine had not been sufficiently tested, adding the aim was to have a safe product rather than just being first to start vaccinating people.

“It can be dangerous to start vaccinating millions, if not billions, of people too early because it could pretty much kill the acceptance of vaccination if it goes wrong, so I’m very sceptical about what’s going on in Russia,” Spahn said.

President Vladimir Putin announced on Tuesday that Russia had become the first country to grant regulatory approval to a COVID-19 vaccine after less than two months of human testing.