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.

Ukraine has launched one of its deepest strikes into Russia, hitting the Kupol Electromechanical Plant in Izhevsk, nearly 800 miles from the front line. -The facility is a key manufacturer of Russian air defense systems and drones.

Three people have been killed and 35 taken to hospital following an attack by Ukraine on a factory in the city of Izhevsk - more than 1,000km (620 miles) from the border, Russian authorities say.