KYIV, Ukraine (AP) — U.S. weapons deliveries to Ukraine haven’t stopped despite the Iran war, and Ukrainian long-range strikes continue to hammer Russian oil production and manufacturing plants, Ukrainian President Volodymyr Zelenskyy said Thursday.

“Of course, we are hitting what is painful for Russia, and it is very painful,” Zelenskyy said in voice messages to reporters. He said that Russian losses in the strikes have reached tens of billions of dollars.

It wasn’t possible to independently verify Zelenskyy’s comments, but Russian officials have reported that attacks have struck infrastructure in regions more than 1,000 kilometers (600 miles) inside Russia.

While Russia presses its all-out invasion, which began on Feb. 24, 2022, Ukraine is using its domestically developed drone and missile technology to strike Russian territory. The Ukrainian military also uses American-made Patriot air defense systems to stop Russian missile attacks on Ukraine’s territory.

“We see that the Russians do not want to stop — they are hitting our energy sector and our people. We will respond,” Zelenskyy said.

Prince Harry praises Ukraine’s resistance
Ukraine’s fight against Russia’s bigger army drew renewed praise from Prince Harry, who arrived in Kyiv on Thursday for his third visit in a year.

Ukrainians have demonstrated “strength not just in bravery and capability, but in unity, in trust,” he said in a speech to a Kyiv security conference

Ukraine “continues to hold together, and hold together you must,” he said.

The Duke of Sussex stepped off a train in Kyiv’s main station after an overnight journey from Poland, which is the only way to travel to the Ukrainian capital.

It wasn’t clear whether Harry would meet with Zelenskyy, who was due to attend a summit of European Union leaders in Cyprus on Thursday evening.

Russian firefighters tackle huge drone strike blaze
Hours before Harry arrived, three people were killed and 10 were wounded in a Russian drone attack on the central Ukrainian city of Dnipro, according to Oleksandr Hanzha, the head of the regional military administration.

A 13-story building and an administrative building were damaged in the strike, Hanzha said on the Telegram messaging app.

Russian air defenses, meanwhile, intercepted 154 Ukrainian drones over Russian regions, the annexed Crimea Peninsula, the Sea of Azov and the Black Sea, the Russian Defense Ministry said.

Authorities in the Krasnodar region on Russia’s Black Sea coast said that 276 firefighters at the Black Sea port of Tuapse were fighting for a third straight day a huge blaze caused by a Ukrainian drone attack earlier this week.

Toxic material from the fire fell with rain, covering several districts of Tuapse with a black layer of dirt, the region’s emergency headquarters reported. The concentration in the air of chemicals from the fire surpassed admissible levels, officials said, and authorities advised residents to stay indoors.

Ukraine targets more Russian oil facilities
For the second consecutive night, Russia’s Samara region also was targeted. In the Samara city of Novokuybyshevsk, about 1,000 kilometers (600 miles) east of the Ukrainian border, a drone attack on an unspecified industrial facility killed one person, regional Gov. Vyacheslav Fedorishchev said.

Drone debris also fell on a roof of a residential building in the city of Samara, wounding a number of people, Fedorishchev said. One person was hospitalized.

Unconfirmed media reports said that a petrochemical plant in Novokuybyshevsk owned by the Rosneft oil and gas company came under attack.

Ukrainian forces also struck Russian oil infrastructure in the Samara region and a pipeline in the Nizhegorodskaya region that transports oil from Western Siberia to Tatarstan, said Andriy Kovalenko, the head of Ukraine’s Center for Countering Disinformation.

An oil refinery in the Samara region and an oil pipeline in the Nizhegorodskaya region were hit, he said. The pipeline transports oil from Western Siberia to Tatarstan. He didn’t offer more details about the strikes.

Also, units of Ukraine’s Security Service struck the Gorky oil pumping station in Russia’s Nizhny Novgorod region east of Moscow, said a senior official from the agency, which goes by the abbreviation SBU.

The nighttime drone attack damaged three oil tanks and caused a large fire, the official said. The official wasn’t authorized to comment publicly and spoke on condition of anonymity.

“The operation of main pipelines is disrupted, the efficiency of processing at refineries decreases, and transportation costs increase. As a result, this directly affects the revenues of the Russian budget, which are used to finance the war against Ukraine,” the official said.