Drones again flew into Russia's capital of Moscow early Tuesday.

The Russian defense ministry says Ukraine attempted to attack Moscow and its suburban areas with three drones on Tuesday. It says one of the unmanned aircraft crashed in a business district of high-rise office towers.

Moscow Mayor Sergei Sobyanin, who posted the information on a messaging app, said an office building's facade on the 21st floor was damaged and windows in about 150 square meters of the building were shattered. He said no injuries were reported.

A woman who works in an adjacent building said she was scared, and that she wants the national authorities to take steps to prevent recurrences.

In the same business district, a drone crashed and damaged a building on Sunday.

Russian presidential spokesperson Dmitry Peskov commented on Tuesday's attacks. He said, "The threat does exist and it is clear. Measures are being taken."

The defense ministry also said Tuesday that its naval forces had thwarted attacks by three Ukrainian unmanned boats on Russian warships in the Black Sea. It said the Ukrainian attacks took place 340 kilometers southwest of the military port city of Sevastopol in Crimea, which Russia unilaterally annexed from Ukraine.

In Ukraine, six people were killed in Kryvyi Rih, the eastern region of Dnipropetrovsk, in a Russian missile attack Monday. Kryvyi Rih is the hometown of President Volodymyr Zelenskyy.

Elsewhere in Ukraine, the governor of the southern region of Kherson said four people were killed in Russian shelling in the city of Kherson.

The governor of the eastern Kharkiv region said one person was injured when Russian drones attacked a school, sports facility and others in the region.