Ukrainian forces targeted Moscow on Tuesday with what Russian authorities are describing as the largest ever drone attack on the Russian capital.

Ukraine reportedly launched at least 337 drones into Russia on Tuesday in the largest-yet drone attack of the Moscow-Kyiv conflict, according to the Russian Ministry of Defense.

The assault, which the mayor called the largest on Russia’s capital since the war began, was a reminder of Ukraine’s power to strike as its president proposes an air truce.