Russia's foreign minister has accused Western powers of "de facto" fighting against his country through their military support for Ukraine.

"You can call it anything you want, but they are fighting with us, they are straight-up fighting with us," Foreign Minister Sergei Lavrov told journalists at the United Nations on Saturday.

Westerners are "de facto fighting against us, using the hands and bodies of Ukrainians," Lavrov added, pointing to the billions of dollars in Western military equipment provided to Kyiv since Russia attacked last year.

Last week, United States President Joe Biden met with Ukrainian counterpart Volodymyr Zelensky in Washington after the two spoke at the UN General Assembly in New York. Biden announced in a press conference with Zelensky more US military aid to Ukraine, including the delivery of M1 Abrams tank this week.

Lavrov also claimed that US and Britain are giving intelligence support and Western military advisors are present in Ukraine.

Lavrov's statement came on the same day Kyiv announced a missile attack on Moscow's Black Sea Fleet headquarters in the Crimean port of Sevastopol, killing senior naval commanders.

Agence France-Presse has not been able to verify the information from Kyiv.

Russia has said one of its servicemen is missing after the attack.

Meanwhile, a Ukrainian drone strike hit an administrative building in the center of Russia's southern Kursk city, authorities said Sunday.

A second shipment of Ukrainian wheat also reached Turkey via the Black Sea on Sunday, according to maritime traffic monitoring sites, despite Russian threats to attack boats heading to or from its neighbor and enemy.

The Palau-flagged bulk carrier Aroyat — laden with 17,600 tons of wheat — left the port city of Chornomorsk on Friday bound for Egypt.