"Mass vaccination will be with some delay, only due to the fact that the main part of the produced vaccine will subject to post-registration studies. After that, the rest of the products will be for civilian sales. There will be a delay of 2-3 weeks, maybe a month," Gintsburg said.

The scientist also said that post-registration studies of the vaccine would take from four to six months.

Earlier this week, Russia registered the world's first COVID-19 vaccine, named Sputnik V and developed by the Gamaleya Institute. The Russian Ministry of Health has said that Sputnik V had undergone all necessary checks and proven to be capable of building immunity against the virus.