Ukraine's forces have made gains in the southeast, recapturing a trio of frontline villages, reported CNN, quoting a defense official and a Ukrainian army brigade.
CNN, however, said that Zelensky has provided few details, and CNN cannot independently verify battlefield reports.
The developments come a day after President Volodymyr Zelensky gave his clearest indication yet that Ukraine's counteroffensive is underway.
Ukrainian President Volodymyr Zelensky said Saturday that the counteroffensive actions in his country are underway, reported Xinhua, quoting the government-run Ukrinform news agency.
"Counteroffensive and defensive actions are taking place in Ukraine," Zelensky said at a joint press conference with Canadian Prime Minister Justin Trudeau in Kiev.
Zelensky noted that he is in daily contact with Ukraine's military commanders, including Valery Zaluzhny, chief commander of the armed forces of Ukraine.
The Ukrainian leader refused to give more details about the counteroffensive operation.