Russia conducted a "massive" barrage of strikes on critical infrastructure in Kyiv, Kharkiv and other cities on Monday morning, Ukrainian authorities reported.
Part of the Ukrainian capital was cut off from power and water supplies due to the attacks, Kyiv mayor Vitali Klitschko said.
Officials reported possible power outages in the cities of Kharkiv and Zaporizhzhia too.
Critical infrastructure objects were also hit in the Cherkasy region southeast of Kyiv, and explosions were reported in other regions, including Vinnytsia in central Ukraine, Dnipropetrovsk and Zaporizhzhia in the southeast, and Lviv in western Ukraine.
In Kharkiv, the subway ceased operating. Some parts of Ukrainian railways were also cut off from power, the Ukrainian Railways reported.
Ukrainian sources claim Moscow forces used drones and strategic bombers in Monday's wave of strikes. There were no immediate reports of possible casualties.
The attack comes two days after Russia accused Ukraine of a drone attack against Russia's Black Sea Fleet off the coast of the annexed Crimean Peninsula.
Ukraine has denied the attack, saying that Russia mishandled its own weapons, but Moscow still announced halting its participation in an UN-brokered deal to allow safe passage of ships carrying grain from Ukraine.
Commenting on Monday's attacks, the head of Ukraine's presidential office Andriy Yermak said that Russian forces "continue to fight with civilian facilities".
"We will persevere, and generations of Russians will pay a high price for their disgrace," Yermak said.
It's the second time this month that Russia unleashed a massive barrage of strikes on Ukrainian infrastructure.
On 10 October, a similar attack rocked the war-torn country following an explosion on the
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