All four Russian airports halted operations Monday after Ukrainian drones were shot down overhead. Ukrainian drones have been causing disruption in the airport district in recent weeks. On Friday, airports in the region were also closed due to another drone found in Russian airspace. Earlier this month, Ukrainian drone boats badly damaged the Russian warship Olenegorsky Gornyak. A day later, sea drones hit a critical link in the supply chain used to transport fuel and military equipment between Russia and Syria.

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Persons: — Margarita Simonyan, Simonyan, Olenegorsky Organizations: Service, Tass, Russian Defense Ministry, The Telegraph, CNN Locations: Wall, Silicon, Moscow, Russian, Zhukovsky, Ruza District, Istra District, Western, Russia's, Ukrainian, Russia, Syria