(Reuters) -President Volodymyr Zelenskiy said on Friday that Ukraine was working on the rapid development of interceptor drones to counter the swarms of Russian drones that have been descending on Ukrainian cities in increasing numbers in recent weeks.

Authorities say Russian drones have slammed into two Ukrainian cities, killing at least one person in nighttime attacks.

Moscow’s drone strikes have grown exponentially thanks in part to a deal with Iran to produce its Shahed drones on Russian soil. An attack overnight that focused on Kyiv killed at least 15.