Ukraine said its drones hit a Russian research and production facility that supplies components for missiles, as Russia unleashed a fresh barrage of air attacks overnight.

Two Ukrainian drones struck the site of an electronics developer and manufacturer in Cheboksary, which temporarily halted operations to protect employees, Oleg Nikolayev, governor of Russia’s Chuvashia region that’s located 1,300 km (800 miles) from the border with Ukraine, said in a Telegram post.

The plant is involved in the missile production process, including for the Iskander system, said Andriy Kovalenko, head of the Ukrainian Center for Countering Propaganda, on Telegram. It also produces navigation systems for Russian Shahed drones and components used in glide bombs, according to the Ukrainian unmanned systems forces.

The attack on the electronics plant comes as Russian forces have been targeting Ukraine with major missile and drone strikes for several days. U.S. President Donald Trump said last week that Russian President Vladimir Putin warned in a telephone call that Moscow would retaliate for Ukrainian drone operations that destroyed several strategic nuclear bombers at airfields across the country.

Russia overnight launched 499 drones and missiles, including four Kinzhals and 14 cruise missiles, Ukraine’s air defense forces said Monday on Telegram. The military shot down or jammed 479 of them, it said.

Ukraine regularly targets Russian plants involved in military production, as Moscow’s full-scale invasion continues into its fourth year. While officials from Kyiv and Moscow have held direct talks in Turkey twice in the past month, Russia has so far refused calls by the U.S., Europe and Ukraine to agree to a ceasefire to allow for peace negotiations.

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