MOSCOW (Reuters) -Russian air defences repelled an attack by four drones flying towards Moscow, Mayor Sergei Sobyanin said on Friday, with no injuries reported in the capital or in an earlier attack on an oil complex in one of Russia's southern regions.

The assault, which the mayor called the largest on Russia’s capital since the war began, was a reminder of Ukraine’s power to strike as its president proposes an air truce.

Russian air defences on Friday repelled an attack by four drones flying towards Moscow, with no injuries reported in the capital or in an earlier attack on an oil complex in one of Russia’s southern regions.

Ceasefire efforts come at a time when Ukraine is fast losing ground on the battlefield amid a freeze in US military aid and intelligence sharing

"The air defense forces repelled an attack by four drones heading toward Moscow," he wrote. "Emergency service specialists are working at the sites where debris fell." Read also: Drone attack hits Moscow suburbs,