KYIV, Ukraine — A Ukrainian drone struck a Russian industrial plant some 800 miles from Ukraine, a local official said Tuesday, after Ukrainian President Volodymyr Zelenskyy prioritized the weapon’s development and Russian President Vladimir Putin pounded Ukraine with a monthly record of drones in June.

Both sides in the more than three-year war following Russia’s February 2022 invasion of its neighbor have raced to improve drone technology and enhance their use on the battlefield. They have deployed increasingly sophisticated and deadlier drones.

Ukraine is under severe strain from a Russian push at places on the roughly 620-mile front line, but analysts say its defenses are largely holding firm. With recent direct peace talks delivering no progress on U.S.-led international efforts to halt the fighting, Russia and Ukraine are bulking up their arsenals.

Russia last month launched 5,438 drones at Ukraine, a monthly record, according to official data collated by The Associated Press.

Meanwhile, a Ukrainian drone hit an industrial plant in Izhevsk, about 620 miles east of Moscow, killing three people and injuring 35, said Alexander Brechalov, head of the Udmurtia region.

The drone struck the Kupol Electromechanical Plant, which produces air defense systems and drones for the Russian military, according to an official with Ukraine’s Security Service, the SBU. At least two direct hits were recorded on the plant’s buildings, the official said, speaking on condition of anonymity.

Ukraine has for months been using domestically produced long-range drones to strike plants, storage sites and logistical hubs deep inside Russian territory. In May last year, a Ukrainian drone hit an early-warning radar in the Russian city of Orsk, some 1,120 miles from the Ukrainian border, Kyiv officials claimed.

Zelenskyy said Ukraine’s domestic production of drones is about to increase in response to Russia’s expanded barrages. “The priority is drones, interceptor drones and long-range strike drones,” he said late Monday on Telegram.

“This is extremely important,” he added. “Russia is investing in its unmanned capabilities, Russia is planning to increase the number of drones used in strikes against our state.”

Russia’s Defense Ministry said that 60 Ukrainian drones were downed overnight over several regions, including 17 over Russian-occupied Crimea, 16 over Russia’s Rostov region and four over its Saratov region.

At the same time, four Russian Shahed drones struck the southern Ukraine city of Zaporizhzia at night, leaving more than 1,600 households without power, according to authorities.

Ukraine’s air force said Tuesday that Russia fired 52 Shahed and decoy drones at the country overnight.

President Donald Trump’s special envoy to Ukraine and Russia, retired Lt. Gen. Keith Kellogg, rebuked Russia for continuing to strike civilian areas of Ukraine while effectively rejecting a ceasefire and dragging its feet on a peace settlement.

“We urge an immediate ceasefire and a move to trilateral talks to end the war,” Kellogg said on X late Monday. “Russia cannot continue to stall for time while it bombs civilian targets in Ukraine.”

Ukraine is developing its own defense industry as uncertainty remains over whether the Trump administration will continue to provide crucial military aid.

For March and April, the U.S. allocated no new aid to Ukraine, according to Germany’s Kiel Institute, which tracks such support.

Europe continues its support and for the first time since June 2022 surpassed the U.S. in total military aid, totaling $85 billion compared with $77 billion from the U.S., the institute said last month.

Putin and French President Emmanuel Macron on Tuesday held their first direct telephone in almost three years. Macron’s office said he “called for a ceasefire” and peace talks.