Large-scale Russian attacks on Ukraine’s energy infrastructure caused extensive blackouts in the southern city of Odesa and nearby areas on Saturday, leaving more than one million households without electricity, Ukrainian officials said.

President Volodymyr Zelenskyy said Russia had attacked Ukraine with more than 450 drones and 30 missiles.

"The brunt of the attack was on our energy system, on the south and Odesa region," Zelenskyy wrote on Telegram, adding that thousands of families in seven regions across Ukraine were left without power.

Prime Minister Yulia Svyrydenko said it was one of the war's largest attacks on Odesa, where supplies of electricity and water had been knocked out. She said supplies of non-drinking water were being brought in to areas of the city.

Ukraine's interior minister Ihor Klymenko said more than a million households across Ukraine had been left without power and five people had been wounded as a result of the attack.