French President Emmanuel Macron is due to host European leaders Monday for a conference aimed at strengthening Western support for Ukraine, two years into the Russian invasion.
The meeting in Paris will be a chance for participants to "reaffirm their unity as well as their determination to defeat the war of aggression waged by Russia in Ukraine", the French presidency said.
Ukrainian President Volodymyr Zelensky promised victory against Russia on the second anniversary of the invasion on Saturday as his troops fight on despite a lack of Western aid and recent Russian gains.
"We will win," he said at a ceremony at Kiev's Gostomel airport, which was targeted by Russia in the first days of the all-out assault in 2022.
The United States plans to impose sanctions Friday on more than 500 targets involved in Russia's war in Ukraine, as Moscow claims fresh battlefield advances two years after its invasion.
Ukraine, grappling with hold-ups to much-needed Western military aid, has been pushed back from the front line in recent months.