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 said it came under a massive Russian missile attack on Wednesday morning that forced emergency power cuts across large swathes of the country.

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.

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.

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