A Ukrainian drone strike killed at least five people in Russia’s Kursk region, local officials said Saturday, while rescuers in the Ukrainian city of Dnipro dug through rubble after a Russian attack ripped through a nine-story residential building, leaving one dead.

Two children were among the victims of the Ukranian attack in the village of Gorodishche on the Russian-Ukrainian border, Gov. Alexey Smirnov said on social media.

In Dnipro, at least one person died and 12 were injured, including a 7-month-old girl, after a Russian strike destroyed the top four floors of the apartment bloc Friday evening, regional head Serhii Lysak said.

The attacks came as Russia continues to stretch out Ukrainian forces in several areas along the 1,000-kilometer (600-mile) front. Moscow has stepped up airstrikes in a bid to drain Ukraine’s resources, often targeting energy facilities and other vital infrastructure.

Ukrainian President Volodymyr Zelenskyy said the country had lost about 80% of its thermal power and one-third of its hydroelectric power in Russian strikes.

Discussing the attack in Dnipro, Zelenskyy said it was a reminder to Ukraine’s allies that the country needed more air defense systems. The Ukrainian air force said Saturday that it had downed 10 Russian drones overnight.

“This is why we constantly remind all of our partners: only a sufficient amount of high-quality of air defense systems, only a sufficient amount of determination from the world at large can stop Russian terror,” he said.

Kyiv has also struck back at Russia with its own aerial attacks, also often targeting energy infrastructure.

In its morning statement, the Russian Defense Ministry said that six Ukrainian drones had been shot down overnight over the country’s Tver, Bryansk and Belgorod regions, as well as over the annexed Ukrainian peninsula of Crimea. It did not give information on the reported strike in the Kursk region.