A senior Russian military chief handed to a US military attache in Moscow a part of a Ukrainian drone containing data he said proved that the Ukrainian military this week had targeted a Russian presidential residence.
Moscow accused Kiev on Monday of trying to strike a residence of President Vladimir Putin in Russia's northern Novgorod region with 91 long-range attack drones.
It said Russia would review its negotiating position in ongoing talks with the US on ending the Ukraine war.
Ukraine and Western countries have disputed Russia's account of the strike.
A video posted on the Russian Defence Ministry's Telegram channel showed Admiral Igor Kostyukov, head of the Main Directorate of the General Staff of Russia's Armed Forces, handing to the US attache the controlling mechanism of a drone found among downed fragments.
"The decryption of the content of the memory of the navigation controller of the drones carried out by specialists of Russia's special services confirms without question that the target of the attack was the complex of buildings of the Russian president's residence in Novgorod region," Kostyukov said.
"We presume that this measure will do away with any questions and allow for the truth to be established."
He showed the US military representative a device, adding that several drones shot down during the attack had their navigation systems well preserved.
"In several of these drones, the navigation systems are well-preserved and technically functional," he said.
Kostykov then handed the device to the US representative, saying, "We want to hand over this controller and the description of this controller made by our specialists to you. We believe that this step will help to remove all questions and contribute to the establishment of the truth."
The ministry had earlier posted a statement on Telegram saying its findings would be turned over to the United States.
US President Donald Trump expressed sympathy for the Russian charge, telling reporters on Monday that Putin had informed him of the alleged incident and that he was "very angry" about it.
