Air defences were engaged in Ukraine's capital of Kyiv on Thursday to repel a Russian drone attack, officials said, and Reuters witness reported explosions in the city while British Prime Minister Keir Starmer was visiting.

Ukrainian President Volodymyr Zelenskyy warned allies that the defense of his nation is a litmus test for broader Western resolve.

Ukrainian officials say Russia has launched a major ballistic and cruise missile attack on regions across Ukraine.

While the Norwegian jets are primarily in Poland to help defend a key logistics hub bringing materiel into Ukraine, rogue Russian missiles and drones have entered Polish airspace several times since the full-scale invasion began.

Ukraine struck Russian regions with a major drone and missile attack overnight, damaging factories in at least three cities, officials and media said. The Shot Telegram channel said that Russia had downed more than 200 Ukrainian drones and five U.

NATO member Poland scrambled fighter jets after overnight Russian missile and drone attacks on Ukraine, Warsaw's military said on Wednesday. A spokesperson for the Operational Command of the Polish Armed Forces told Newsweek that "intense long-range aviation activity" from Russia had been detected early on Wednesday.

Ukraine introduced emergency power cuts in six regions amid what authorities described as a "massive" Russian missile strike, the national grid operator said on Wednesday. Kyiv's air force had warned of numerous groups of missiles launched by Russia amid a nationwide air-raid alert,

Russia's military on Tuesday said it would retaliate against Ukraine after Kyiv attacked Russian regions by firing six U.S.-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and launching one of the biggest drone attacks to date.

Ukrainian forces used missiles and drones on Tuesday to target sensitive military and energy sites across Russia.

Officials in several Russian regions, some hundreds of kilometres from the border, reported strikes overnight.