Russia and Ukraine exchanged large drone attacks on Sunday night into Monday, with alleged Ukrainian UAVs forcing flight restrictions at three Russian airports.

Ukrainian drones attacked key military facilities in Russia, including the Smolensk Aviation Plant and a refinery. The information was provided by the General Staff in Kyiv. Ukrainian drones conducted attacks on strategic targets in Russia,

The Smolensk Aviation Plant produces the Soviet-designed Su-25 ground attack aircraft, as well as Kh-55 and Kh-59 missiles.

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.

Ukraine claimed Saturday to have struck one of Russia’s largest oil refineries in a drone attack, starting a fire at the facility more than 700 miles into Russian territory.

A fire erupted in the city of Kazan in Russia's Tatarstan republic overnight on Jan. 20 amid a Ukrainian drone attack on the city, Russian Telegram channels reported.

Ukrainian drones attacked key military facilities in Russia, including the Smolensk Aviation Plant and a refinery. This information was provided by the General Staff in Kyiv. Ukrainian drones conducted attacks on strategic targets in Russia,

"At 11:18, a strike was recorded in the Shevchenkivskyi district," Synehubov wrote. Read also: Russian forces attack civilian infrastructure in Kharkiv Oblast The attack involved a Shahed kamikaze drone.

An attack has reportedly targeted the Smolensk Aircraft Plant.