The Russian military said it struck an oil processing plant and fuel depots around the strategic Black Sea port of Odessa.
Spokesman for the Russian Defense Ministry, Maj. Gen. Igor Konashenkov said Russian ships and planes on Sunday fired missiles to hit the facilities, which he said were used to supply fuel to Ukrainian troops near Mykolaiv.
Konashenkov also said Russian strikes destroyed ammunition depots in Kostiantynivka and Khresyshche.
In an audio message published by Italian news agency ANSA, Italian photographer Carlo Orlandi said Odessa woke up at 5.45 a.m. on Sunday to military sirens, followed immediately by the sound of bombs falling on the port city for two planes.
He described a column of black smoke rising from the targets and flames coming from the buildings.
“What we can see is a thick screen of black smoke, and one explosion after another,” Orlandi said.
Elsewhere in Ukraine, the mayor of the capital kyiv, Vitali Klitschko, said he was shocked by what he described as “cruel war crimes” committed by Russian soldiers in the town of Bucha northwest of the capital. .
Referring to reports of civilians being executed, Klitschko told German daily Bild on Sunday that “what happened in Bucha and other suburbs of Kyiv can only be called genocide.”
An AP team viewed the bodies of at least nine people on Sunday who appear to have been executed. At least two of them had their hands tied behind their backs. They were all in civilian clothes and at least three were naked from the waist down. One of them appeared shot in the chest at close range.
Klitschko said Russian President Vladimir Putin was responsible for these “cruel war crimes”, adding that civilians had been “shot with their hands tied”.
He called on the whole world and especially Germany to immediately stop gas imports from Russia.
He said that “especially for Germany there can be only one consequence: no more pennies must go to Russia, it is blood money used to slaughter people. The embargo on gas and oil must intervene immediately”.