Moscow launched more than 40 missiles, and at least 30 were shot down, said Ukraine’s President Volodymyr Zelenskyy, adding about 70 strike drones were involved in the attack. It remains unclear how many were intercepted.

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

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.

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.

Ukraine used six British Storm Shadow missiles and US-made Atacms tactical ballistic missiles in what Kyiv described as its “largest attack” on Russian military facilities.

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.

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.