Russia claims to have successfully developed the world's first "antidote" to Covid-19. Early tests have shown the antiviral drug to be more than 99% effective, according to the Federal Medical and Biological Agency (FMBA)."This is the first etiotropic drug that directly affects the virus," Veronika Skvortsova, head of the FMBA, told the Russian Prime Minister Mikhail Mishustin.