NATO fighter jets were scrambled and ground-based air defense systems put on high alert in Poland and Romania during an overnight Russian attack on Ukraine.

A Russian drone and missile barrage has killed 20 people, including two children, in a western Ukrainian city, around 200 kilometres from the Polish border.

A drone has struck a Turkish-flagged tanker in Ukraine's Odesa region and set it ablaze. Monday's strike at Izmail port came a day after Ukrainian President Volodymyr Zelenskyy signed a deal to import U.

A drone was detected around five miles into Romanian airspace in the early hours of Wednesday morning, the country's defense ministry said.

DNIPRO, Ukraine (Reuters) -Russian drones damaged a building housing the Dnipro newsroom of public broadcaster Suspilne and Ukrainian Radio Dnipro in a major overnight attack on the city, Suspilne said early on Tuesday.