The Kremlin has dismissed calls to provide evidence to support its claim that Ukraine launched an attack using dozens of drones against one of Russian President Vladimir Putin’s residences.

Moscow accused Kyiv 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 U.S. on ending the Ukraine war.

At the moment we suspect aggravated disruption of telecommunications and also aggravated sabotage,” Helsinki's police chief said.

Two of the main sticking points involve territory and the fate of Europe's biggest nuclear plant, which is currently occupied by Russia.

Moscow reported a deadly strike on a hotel in territory it occupies in southern Ukraine while Kyiv said Russia attacked its power supplies.

Leaders from Europe and Canada have held talks on U.S.-led peace efforts to end the war between Russia and Ukraine.

Confidential complaints filed by troops and their families reveal patterns of wrongdoing in the ranks that are hidden from the Russian public.