Russian air defenses shot down 31 Ukrainian drones in a nighttime attack on border regions, the Russian Defense Ministry said Wednesday, in what appeared to be Kyiv’s largest single cross-border drone assault reported by Moscow since it launched its invasion 20 months ago.

The Defense Ministry didn’t provide any evidence for its claims nor any details about whether there were any damage or casualties.

It also said Russian aircraft thwarted a Ukrainian attempt to deploy a group of soldiers by sea to the western side of Russian-annexed Crimea.

The force attempted to land on Cape Tarkhankut, on Crimea’s western end, using a high-speed boat and three jet skis, the ministry said.

Moscow’s claims could not be independently verified, and Ukrainian officials made no immediate comment.

The Crimean Peninsula, which Russia illegally annexed from Ukraine in 2014, has been a frequent target of Ukrainian attacks. The region has been the key hub supporting the invasion.

Ukraine is pressing on with a slow-moving counteroffensive it launched three months ago, even as uncertainty grows over the scale of the future supply of weapons and ammunition from its Western allies.

Adm. Rob Bauer, the head of NATO’s Military Committee, sounded the alarm about depleted stockpiles.

With the war of attrition likely continuing through winter into next year, Bauer said of weapons systems and ammunition supplies: “The bottom of the barrel is now visible.”

He urged the defense industry to boost production “at a much higher tempo. And we need large volumes,” he told the Warsaw Security Forum, an annual conference, on Tuesday.

Also, the Pentagon has warned Congress that it is running low on money to replace weapons the U.S. has sent to Ukraine.

Concern about the commitment of Kyiv’s allies has also grown amid political turmoil in the United States amid the unprecedented and dramatic ouster Tuesday of House Speaker Kevin McCarthy.

Some in the House Republican majority, and many GOP voters, oppose sending more military aid to Ukraine. The U.S. is by far Ukraine’s largest military supplier.

The concerns prompted U.S. President Joe Biden to hold a phone call Tuesday with key allies in Europe, as well as the leaders of Canada and Japan, to coordinate support for Ukraine.

The call came three days after Biden signed legislation hastily sent to him by Congress that kept the federal government funded but left off billions in funding for Ukraine’s war effort that the White House had vigorously backed.

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Follow AP’s coverage of the war in Ukraine at https://apnews.com/hub/russia-ukraine