Phase three clinical trials in the Philippines are due to run from October to March 2021, after a panel of vaccine experts completes its review on Russia's phase one and two trials in September, Harry Roque, Duterte's spokesman, told a briefing.

Russia on Tuesday became the first country to grant regulatory approval for a COVID-19 vaccine, to be named "Sputnik V" in homage to the Soviet Union's launch of the world's first satellite.

(Reporting by Neil Jerome Morales and Karen Lema; Editing by Ed Davies)