Nearly 50 plane flights in and out of the capital were disrupted after Russia said it jammed a Ukrainian drone in the Ruzsky district west of the capital and destroyed another one in the Istrinsky district nearby.
Arrivals and departures from Moscow's four main airports - Vnukovo, Domodedovo, Sheremetyevo and Zhukovsky - were restricted, disrupting 45 passenger planes and two cargo planes, Russian aviation authority Rosaviatsia said.
Russian officials have repeatedly cautioned that military drones flying over Moscow - which along with its surrounding region has a population of nearly 22 million people - could cause a major disaster.
Drone air strikes deep inside Russia have increased since two drones were destroyed over the Kremlin in early May.
It is unclear what impact the drone attacks will have on perceptions of the war among the Russian population. Polling indicates support for the Russian military operation in Ukraine remains high, around 75 per cent, though there are questions over how accurate polling is in Russia.
Ukraine typically does not comment on who is behind attacks on Russian territory, although officials have publicly expressed satisfaction over them.
Meanwhile Ukraine is considering using its newly tested wartime Black Sea export corridor for grain shipments after the first successful evacuation of a vessel on the route last week, a senior agricultural official said on Monday.
Russia has blockaded Ukrainian ports since it invaded its neighbour in February 2022 and threatened to treat all vessels as potential military targets after pulling out of a UN-backed safe passage deal last month.
In response, Ukraine announced a "humanitarian corridor" hugging the sea's western coastline near Romania and Bulgaria. A Hong Kong-flagged container ship stuck in Odesa port since the invasion travelled the route last week without being fired upon.
"Only one commercial vessel has passed through so far, it has shown readiness to move by alternative routes," Denys Marchuk, deputy head of the Agrarian Council, Ukraine's largest agribusiness organisation, told national television.
"Further, there should be a movement of potentially 7-8 more ships ... then perhaps in the future these alternative routes will become a corridor for the movement of ships that are travelling with cargoes of grain and oilseeds," he said.
The Financial Times said Kyiv was finalising a scheme with global insurers to cover grain ships travelling to and from its Black Sea ports, citing Ukraine's Deputy Economy Minister Oleksandr Gryban.
Ukraine is a global major grain grower and exporter and normally ships millions of metric tons of food from its deep-water Black Sea ports of Odesa and Mykolaiv, but has had to rely on its Danube river ports after Russia pulled out of the deal.
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