Ukraine’s air force said the city had been targeted with drones and Kalibr cruise missiles.

GLEB GARANICH/REUTERS

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Russia mounted an intense missile and drone barrage of the Ukrainian capital overnight, killing at least four people, according to Ukrainian officials, and sending powerful explosions reverberating across the city.

The night of attacks followed a warning from Russian President Vladimir Putin, conveyed via U.S. leader Donald Trump, that the Kremlin would hit back against Kyiv after Ukrainian drones destroyed several of Russia’s strategic bomber aircraft in coordinated attacks deep inside Russia.