As India's inoculation drive slows down, Russia's Sputnik V is the third vaccine in the country's kitty. With the necessary approvals in place, at least six manufacturers in India, including the Hetero Group of Companies, will be making a total of 900 million doses of the contentious vaccine. Divya Shekhar and Manu Balachandran give you a peek into the big gambit to ramp up production of the Sputnik V in India