Russia said on Friday it had conducted large-scale tests of new laser-based systems to defend against drones.A government statement described the new technology as "promising" and said it had been tested against various types of drone in different weather conditions.

At least 10 Ukrainian drones were shot down on their approach to Moscow overnight into Sunday morning, according to the city's mayor.

Ukraine's president says a new prisoner exchange with Russia is ongoing and will take days, as both sides continue launching hundreds of attack drones.

But the success of Ukraine’s drone and sabotage operations challenges that theory of victory. It shows that Ukraine is not simply holding the line or surviving a war of attrition; it is shifting the battlefield and expanding the costs of continued war for Russia in ways the Kremlin has not anticipated.

Russian forces have shot down 10 Ukrainian drones heading towards Moscow, according to the city’s mayor, Sergei Sobyanin, as Ukraine reports at least one person killed in Russian attacks.

Ukraine’s drone strike deep inside Russian territory left Kremlin officials angry and alarmed over the sudden vulnerability of a nuclear-capable air fleet far from the battlefield, according to people close to senior officials in Moscow.