The long-range Russian drones come in swarms each night, buzzing over Ukraine by the hundreds, terrorizing the population and attacking targets from the industrial east to areas near its western border with Poland.

Ukraine has occasionally targeted the Russian capital, but has doubled down on drone strikes on Moscow in recent days.

The latest attack prompted restrictions at all four of Moscow's international airports, according to Telegram posts by Artem Korenyako, a spokesperson for Russia's federal aviation agency Rosaviatsiya. Korenyako said at least 134 aircraft were diverted to alternate airports amid the disruption.

Moscow Mayor Sergei Sobyanin said four drones were shot down on approach to the capital, with blasts heard near Zvenigorod, Istra, and Zelenograd — suburban districts and satellite towns located to the west and northwest of central Moscow.

Deaths have been reported on either side of the border, just hours after a third round of ceasefire talks took place in Turkey.