Russian air defence units downed six Ukrainian drones headed for Moscow on Sunday, mayor Sergei Sobyanin said.

Ukraine said it struck a Russian air base on Saturday, while Russia continued to attack Ukraine with hundreds of drones overnight as part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

Russian air defenses on July 5 shot down four drones advancing on Moscow, prompting a temporary halt to outgoing flights at Sheremetyevo, one of the capital's main airports. Mayor Sergei Sobyanin reported emergency services at the drone downing sites but provided no immediate details on potential damage.