Ukrainian intelligence released a video allegedly showing an operative infiltrating a Russian air base in Lipetsk province and setting fire to two Su-30 fighter jets.
President Zelensky expressed optimism, believing that negotiations with the US and European countries to end the conflict between Ukraine and Russia are nearing a resolution.
Russia denies upcoming trilateral talks with Ukraine and the US, adding that efforts to change Washington's peace proposal cannot improve the situation.
Ukraine published footage showing a suicide drone attacking what it claims are Russian S-400 air defense system launchers on the move in Belgorod province.
Fears of Russian retaliation and legal challenges have prompted Belgium to reject the European Union's proposal to use frozen Russian assets for Ukraine aid.
Ukraine's security service announced the destruction of a MiG-31 fighter, a Pantsir-S2 system, and three Russian radar stations during an attack on the Crimean peninsula.