Putin emphasized that the vaccine underwent the necessary tests and has proven efficient, offering a lasting immunity from the coronavirus. However, scientists at home and abroad have been sounding the alarm that the rush to start using the vaccine before Phase 3 trials — which normally last for months and involve thousands of people — could backfire.

Speaking at a government meeting Tuesday, Putin said that the vaccine has undergone proper testing and is safe.

“I know it has proven efficient and forms a stable immunity, and I would like to repeat that it has passed all the necessary tests,” he said. “We must be grateful to those who made that first step very important for our country and the entire world.”