MOSCOW, April 7. /TASS/. The collusion between US officials and Pfizer COVID vaccine producer made possible to produce pharmaceuticals with serious side effects, Chief of Russia’s Radiation, Chemical and Biological Protection Force Igor Kirillov said on Friday.

"According to information we have, the collusion between officials and Pfizer COVID vaccine producer made it possible to release pharmaceuticals with serious side effects. Meanwhile, Pfizer had real evidence at the time of vaccine approval, supporting higher risk of serious cardiovascular system pathologies after vaccination," Kirillov said.

This is the way how officials from US federal agencies "held later key positions in pharmaceutical companies," the Ministry of Defense said.