Russia has transferred the bodies of 6,060 fallen soldiers to Ukraine, Russian Presidential Aide Vladimir Medinsky said on Monday.
"Today's statements by the Russian side do not reflect the reality and previously reached agreements," the agency said in a statement.
Russia has delivered the first batch of 1,212 bodies of Ukrainian soldiers to the border exchange point pursuant to the Istanbul accords, said Lieutenant General Alexander Zorin.
Russia on Saturday accused Ukraine of indefinitely delaying a planned exchange of prisoners and the handover of fallen soldiers' bodies.
Russian forces launched 400 drones and 40 missiles on Ukraine overnight on Friday, killing at least four people and injuring dozens, Ukrainian authorities said.
Russia has fired nearly 300 missiles and more than 200 Shahed combat drones against Ukraine since December 29, Ukrainian President Volodymyr Zelensky has said.
Urging Congress to release more funds for providing military aid to Ukraine, the US State Secretary said that "Congress needs to act in the new year".
Ukraine has tripled the production of weapons and military equipment this year, President Volodymyr Zelensky has said.
The headlines continue to focus on the war in Gaza, a conflict so horrific that it has overshadowed the war in Ukraine.
The Russian air defence downed 33 Ukrainian drones over several Russian regions, the Russian Defence Ministry said on Sunday.
