A Ukrainian drone strike sparked fires at a Black Sea port in Russia Sunday, officials said, as Moscow claimed further battlefield gains and ahead of new talks aimed at ending the nearly four-year war with Ukraine.

Two people were wounded in the attack on the port of Taman in the Krasnodar region, which damaged an oil storage tank, warehouse and terminals, according to regional Gov. Veniamin Kondratyev.

Meanwhile, falling debris from Russian drones damaged civilian and transport infrastructure in Ukraine's Odesa region, officials said, disrupting the power and water supply.

Ukraine's long-range drone strikes on Russian energy sites aim to deprive Moscow of the oil export revenue it needs to pursue its full-scale invasion.

Russia wants to cripple the Ukrainian power grid, seeking to deny civilians access to heat, light and running water in what Kyiv officials say is an attempt to "weaponize winter."