A massive drone strike rattled Moscow and its suburbs overnight into Sunday, injuring a woman and temporarily halting traffic at some of Russia's busiest airports, while a huge nighttime wave of Russian drones targeted Ukraine, officials reported.

A top UK defence official meanwhile said that Russian forces had suffered their worst month of casualties in October since their full-scale assault on Ukraine in February 2022.

The chief of the UK defence staff, Tony Radakin, said Moscow’s troops suffered an average of 1,500 dead and wounded “every single day,” bringing their total losses in the war to 700,000.

Russia's defence ministry said a total of 70 drones were shot down overnight in Russian territory, including 34 over Moscow's outskirts. Russia's aviation authority said flights were briefly grounded at major international airports including Sheremetyevo and Domodedovo.

A woman in her 50s suffered burns to her face, neck and hands after drones sparked a blaze in her village southeast of Moscow, local Governor Andrei Vorobyov reported.

No one was hurt in Moscow itself, according to Sobyanin, although Russian channels on the messaging app Telegram carried eyewitness reports of drone debris setting fire to suburban homes.

According to Radakin, ordinary Russians were paying “an extraordinary price" for the war, even as a gruelling, monthslong Russian offensive in Ukraine's industrial east continues to eke out gains. He did not say how UK officials had calculated the Russian casualty figures.

“There is no doubt that Russia is making tactical, territorial gains and that is putting pressure on Ukraine,” he said.

But he said the losses were for “tiny increments of land,” and that Moscow's mounting defence and security spending was putting an increasing strain on the country.

Radakin insisted that Ukraine's Western partners should stand by it for “as long as it takes” to beat back Russian aggression, even as allies of US President-elect Donald Trump have signalled that Kyiv may have to cede territory to seek peace.

Both Moscow and Kyiv have kept a tight lid on casualty figures since the start of the full-scale war despite regular reports of Russian forces taking huge losses following “human wave” attacks that aim to exhaust Ukrainian defences.

Meanwhile, Russia overnight launched a “record” 145 drones at Ukrainian territory, according to Ukraine’s air force, 62 of which were shot down. A further 67 were “lost”, the air force said, a likely reference to electronic jamming that caused the drones to veer off course.

At least one person was injured as Russian drones struck residential areas in Ukraine’s southern port of Odesa, local Governor Oleh Kiper reported. (AP)