Ukraine launched its biggest ever drone attack on Moscow on Tuesday but air defenses destroyed all eight of the drones, Russian authorities said, bringing the 15-month war in Ukraine to the heart of the Russian capital.

Drone attacks deep inside Russia have intensified in recent weeks, with strikes on oil pipeline installations and even the Kremlin earlier this month that Moscow has blamed on Ukraine.

Moscow Mayor Sergei Sobyanin said two people were injured, one of whom was hospitalized, in the early morning attack. Moscow's airports remained open. No deaths were reported.