Russia is intensifying its aerial assault on Ukraine with a new class of jet-propelled drones, launching them in large numbers to overwhelm air defenses and force Kyiv to adapt once more in an evolving high-tech arms race, according to Ukrainian officials and military analysts.

President Volodymyr Zelensky said Sunday that jet-powered drones now account for more than half of the unmanned aerial vehicles (UAVs) Russia is using to "wear down" Ukraine. "There were almost 1,500 drones of all types in these four days alone - about 800 of them jet-powered," he said.

Ukrainian officials report that Russia launched more than 2,800 such drones in August, with production capacity estimated at tens of thousands per year. The Geran-4 and Geran-5 models, developed from Iranian Shahed drones, can reach speeds up to 250 mph, and Ukrainian forces have at times scrambled combat aircraft to counter them.

Residents of Kyiv and other cities have grown accustomed to hours-long nighttime raids, and continuous daytime alerts over the past week have brought the capital to a standstill.

In one of the most dramatic recent attacks, a Russian Geran-4 drone struck a munitions warehouse on Friday in Myla, a village outside Kyiv, triggering a chain of explosions over several hours. The Security Service of Ukraine said at least 38 people were killed in what it described as the deadliest attack on the country this year.

Russia can produce about 3,000 of the new jet-powered drones per month, according to Serhiy Beskrestnov, an adviser to President Zelensky on defense technology. "Last month, according to our statistics, there were 1,500 jet UAV attacks," Beskrestnov said. "This month, we've already counted 3,000 jet drones. Based on our intelligence data, the Russians have plans to produce 36,000."

The escalating drone threat underscores the importance of Russia's alliance with Iran, a relationship that Russian President Vladimir Putin highlighted during a meeting with Iranian President Masoud Pezeshkian on Tuesday.

In response to the intensified attacks, President Zelensky has been urging President Donald Trump to supply more Patriot missile systems, which Ukraine says are the only interceptors capable of reliably stopping Russia's ballistic missiles. Zelensky and Trump have worked out a licensing arrangement that would allow Ukraine to eventually build Patriot interceptors domestically. "We'll give them the right to make Patriots," Trump told reporters.

Ukraine has recently received a small number of Patriot interceptors, according to President Zelensky.

Both Russia and Ukraine have stepped up aerial strikes deep into each other's territory in recent months, while the ground war has largely stalled.