KYIV, Ukraine (AP) — Russian attacks on Ukraine killed six people, including a child, and wounded 29, officials said on Saturday, adding that Ukrainian forces damaged more than two dozen Russian tankers and other vessels in the Sea of Azov.

The exchange came as Ukraine’s drones have lately been hitting oil refineries and other infrastructure across Russia to undercut its war effort, triggering a widespread fuel crisis with gasoline shortages. Moscow has responded by intensifying its bombardment on Kyiv and other cities, exposing Ukraine’s vulnerability to ballistic missile strikes.

Ukraine’s General Staff said 21 tankers used to transport oil and petroleum products were damaged overnight, in addition to four tugboats, two cargo ships and a dredging vessel. Russian officials said one person was killed in the Ukrainian drone strikes and that only four ships came under attack.

In Ukraine’s northeast Sumy region, four people were killed, including a child, and 17 people were wounded when two aerial glide bombs hit a crowded area where civilians were present, said Sumy regional head Oleh Hryhorov.

Eleven people, including one child, were wounded in missile and drone attacks overnight on Kyiv, the State Emergency Service reported. In the southern region of Odesa, two people were killed after a Russian missile struck a building, said regional head Oleh Kiper. Another man was wounded by shrapnel.

Explosions and fires were reported across Kyiv’s Solomianskyi, Darnytskyi and Dniprovskyi districts, the emergency service said.

Russia launched 12 missiles, including six ballistic missiles, along with 121 drones against Ukraine overnight, Ukrainian President Volodymyr Zelenskyy said. He said most of the drones and some of the missiles were shot down, but the ballistic missiles reached their targets, reiterating Ukraine’s dire air defense gaps.

Ukrainian air defenses said they shot down or electronically suppressed two missiles and 111 drones. The air force said direct hits were recorded at 11 locations.

Russia’s Defense Ministry said its forces targeted drone production facilities in Kyiv, as well as the ports of Izmail and Chornomorsk in the Odesa region.

The ministry also said Russian air defenses destroyed 178 Ukrainian drones overnight over eight Russian regions, as well as over the Russian-occupied Crimean Peninsula and the Black and Azov seas.

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