Russia has registered three vaccines: Sputnik V, EpiVacCorona, and CoviVac.

"I know for a fact that people with serious chronic medical conditions are getting the vaccines and feeling well. At any rate, I am not aware of any serious side effect from any of the three vaccines that we have registered," Putin told Rossiya 1 broadcaster.

All three vaccines are "effective, reliable and safe," the president added.

"They are all roughly the same in terms of quality. One gives a slightly longer [immunity], another one gives a bit less protection, although still more or less the same, but it is a little gentler," Putin said.