The EU's drug watchdog said on Thursday it had started a "rolling review" of Russia's Sputnik V coronavirus vaccine, a key step towards approval for use across the 27-nation bloc. "EMA has started a rolling review of Sputnik V, a Covid-19 vaccine developed by Russia's Gamaleya National Centre of Epidemiology and Microbiology," the Amsterdam-based European Medicines Agency (EMA) said in a statement. dk/jhe/jxb