Russia's military on Tuesday said it would retaliate against Ukraine after Kyiv attacked Russian regions by firing six U.S.-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and launching one of the biggest drone attacks to date.

Ukrainian forces carried out a massive drone barrage targeting military assets in Russia. As part of its larger campaign to thwart Moscow’s advances, Kyiv launched more than 100 unmanned aerial vehicles (UAVs) along with American-made Storm Shadow missiles and Army Tactical Missile Systems (ATACMS).

The barrage appeared to be one of the largest recent assaults in Ukraine’s campaign to damage Russia’s war machine on its home territory.