DHAKA : Bangladesh's drug regulator on Tuesday approved the Russian Sputnik V vaccine for emergency use against COVID-19, signalling that clearance for China's Sinopharm shot would follow very soon as a supply line from India falters.Dhaka, facing a second wave of the pandemic, is racing to secure more vaccines after its bigger neighbour halted exports of the AstraZeneca -Oxford University shot in response to a record surge in domestic infections.Announcing approval for Sputnik V, Directorate General of Drug Administration head Mahbubur Rahman told reporters: "Hopefully we'll get 4 million doses of Russian vaccine by May."Bangladesh could also approve Sinopharm in coming days, he added.Foreign Minister A.K.