MOSCOW (AP) — Moscow came under one of the largest attacks yet by Ukrainian drones since the start of fighting in 2022, Russian authorities reported Wednesday, saying they destroyed all of those headed toward the capital.

The drone attacks come as Ukrainian forces are continuing to push into Russia’s western Kursk region.

“This was one of the biggest attempts of all time to attack Moscow using drones,” Moscow Mayor Sergey Sobyanin said on his Telegram channel. He said strong defenses around the capital made it possible to shoot down all the drones before they hit their intended targets.

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Russia downed 45 Ukrainian drones overnight, including 11 over the Moscow region.

Some Russian social media channels shared videos of drones apparently being destroyed by air defense systems, which then set off car alarms.

Alexander Bogomaz, the governor of the Bryansk region, which borders Ukraine, reported a “mass” attack on his region but said that all 23 drones were destroyed.

While Ukraine has been bogged down in a land conflict in eastern Ukraine in which the Russians have been driving forward slowly at a heavy cost to both sides, Kyiv has also been attacking Russia with drones. Ukraine has targeted oil refineries and airfields in an attempt to weaken Russia’s fighting potential, and also has targeted the capital several times.

The daring incursion into Russia has raised morale in Ukraine with its surprising success and changed the dynamic of the fighting. But it’s uncertain how long Ukraine will be able to hold the territory it has seized in Kursk.

It has also opened up another front in a fight where Ukrainian forces were already badly stretched. The gains in Kursk come as Ukraine continues to lose ground in its eastern industrial region of Donbas.

The Institute for the Study of War, a think tank based in Washington, said in its daily report late Tuesday that the Ukrainians had made additional advances in their incursion in Kursk, now in its third week.

The Russian state news agency Tass reported that 31 people had died since Ukraine’s attack on Russia began Aug. 6, citing an unnamed source in the medical service — figures which are impossible to verify. It said 143 people had suffered injuries, of whom 79 were hospitalized, including four children.

Ukraine’s attacks on three bridges over the Seym River in Kursk, in areas it does not control, could potentially trap Russian forces between the river, the Ukrainian advance and the Ukrainian border. Already they appear to be slowing down Russia’s response to the Kursk incursion.

Ukrainian forces appear to be striking Russian pontoon bridges and pontoon engineering equipment over the Seym in an area west of the Ukrainian advance point, the Washington think tank said.

Though few details are available, Ukraine appears to be actively seeking to hinder Russians from crossing the river.

Satellite photos from Planet Labs PBC analyzed Wednesday by The Associated Press showed a significant fire on the Seym near the village of Krasnooktyabrskoe.

The blaze appeared on the northern bank of the river on Tuesday, with another fire seemingly in the village itself. Such fires are common after strikes and often signify where ongoing front-line combat is taking place.

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Associated Press writer Jon Gambrell contributed to this report.