Ukraine’s air force said the Odesa, Mykolaiv, Donetsk, Kherson, Zaporizhia and Dnipropetrovsk regions are under attack threat.

The southern port of Odesa and the Mykolaiv, Donetsk, Kherson, Zaporizhia and Dnipropetrovsk regions were all under threat of Russian drone attacks, the air force said on the Telegram messaging app in the early hours of Tuesday morning.

Russia may also be using ballistic weaponry to attack the regions of Poltava, Cherkasy, Dnipropetrovsk, Kharkiv and Kirovohrad, the air force added.

Oleh Kiper, the head of the Odesa region’s military administration, said air defence systems there were engaged in repelling a Russian drone attack.

“Several waves of attacks are likely,” Kiper said on Telegram.

There were also reports on social media of Iranian-made Shahed drones attacking targets in the Mykolaiv region.

Reuters was unable to independently verify the reports of attacks.

This is a developing story. More to follow soon.