Moscow said on Tuesday that Ukraine had fired six U.S.-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and at least 146 drones into Russia in an attack that it said would not go unanswered.

Flight restrictions were imposed at five airports in Russia after Ukraine unleashed an attack reportedly with more than 200 drones and ballistic missiles. Alexander Bogomaz, the governor of the Bryansk region in western Russia, said Ukraine had launched a major missile attack but did not say which missiles had been used.

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.