What we know -- and don't know -- about Russia's 'Sputnik V' vaccine

(CNN)Russia raised eyebrows on Tuesday when it announced the world's first approved coronavirus vaccine for public use. President Vladimir Putin says his own daughter has already received it, but testing is yet to be completed and experts are skeptical about how quickly the vaccine has been registered. While details about the research behind the vaccine are limited, here's what we know so far. What do we know about the Russian vaccine? The vaccine was developed by the Moscow-based Gamaleya Institute, using funding from the Russian Direct Investment Fund (RDIF). The vaccine is named Sputnik V -- a reference to the 1957 Soviet Union satellite. Read More Scientists conducted months of human...