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.

The scale of the assault on Wednesday was not immediately clear, but Ukraine’s energy minister called it “massive.”

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

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

The barrage appeared to be one of the largest recent assaults in Ukraine’s campaign to damage Russia’s war machine on its home territory.

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.

Ukraine is under a massive raid red alert early on Wednesday amid reports of a large-scale attack launched by Russia. Air raid alerts indicate that there is a potential threat of an attack. The alerts may be issued when Russian warplanes take off,

An air-raid warning has been issued across Ukraine on the morning of 15 January due to the threat of missile strikes. Source: map of air-raid warnings; Ukraine's Air Force; monitoring Telegram channels Details: An air-raid warning was issued in all Ukrainian oblasts due to the threat of a missile strike.