Russia launched an air strike on Kyiv early on Sunday and Ukraine's air defence systems engaged in repelling the attack, Ukrainian officials said.

Mayor Vitali Klitschko said on the Telegram messaging app there were explosions in the capital after the region's military administration said that air defence systems were engaged in repelling the attack.

Reuters' witnesses heard several blasts and saw some air weapons being shot down.

(Reporting by Pavel Polityuk, Gleb Garanich and Valentyn Ogirenko in Kyiv; Writing by Lidia Kelly; Editing by William Mallard)