Ukrainian President Volodymyr Zelenskyy accused Russia of launching drones against European countries from shadow fleets.

Zelenskyy said in his daily address on Sunday that intelligence reports indicated that Russia had been using its shadow fleet tankers to launch and control the drones.

"This is yet more evidence why the Baltic Sea and other seas must be closed to Russian tankers – at the very least to the shadow fleet," he said.

Zelenskyy also spoke about the barrage of drones and missiles that were fired into Ukraine by Russia overnight into Sunday, killing at least four people, with Kyiv suffering the heaviest assault.

It was the first major bombardment since an air attack on Ukraine's capital left at least 21 people dead last month.

Russia fired a total of 595 exploding drones and decoys and 48 missiles, Ukraine’s air force said Sunday. Of those, air defenses shot down or jammed 566 drones and 45 missiles.

Besides Kyiv, Zelenskyy said that the bombardment targeted the regions of Zaporizhzhia, Khmelnytskyi, Sumy, Mykolaiv, Chernihiv, and Odesa.

Zaporizhzhia's regional head, Ivan Fedorov, said that three children were among the 27 wounded in the region, adding that more than two dozen buildings were damaged in the capital, which that bears the same name.