Russia attacked the Ukrainian capital with a barrage of drones and missiles Saturday, leaving at least four people dead, while industrial sites in Russia were set ablaze by Ukrainian strikes

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.

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