Turkey has announced it signed a deal for the delivery of 50 million doses of Russia's Sputnik V coronavirus vaccine.

Health Minister Fahrettin Koca said the first deliveries will arrive in May as Turkey tries to speed up the inoculation effort.

The nation of 84m has delivered one shot to more than 13.5m people and the full two doses to nearly nine million since launching its vaccination drive with China's CoronaVac jab in mid-January.