MOSCOW : Russia expects to produce primarily freeze-dried Sputnik V coronavirus vaccine doses by the spring, a top official said, eliminating the need for transport at ultra-low temperatures as part of an ambitious plan to inoculate its population.Vaccine developers globally are scrambling to work out how to ship and store their vials, some of which must be kept in specialised freezers at extremely low temperatures.The logistical challenge was brought into sharp focus after promising interim trial data for the vaccine developed by BioNTech and Pfizer, a major breakthrough in the race to curb the pandemic.This vaccine needs to be shipped and stored at minus 70 degrees Celsius, equivalent to an Antarctic winter, posing a challenge for even.