Ukrainian President Volodymyr Zelensky speaks in Kyiv. File photo

"Counteroffensive and defensive actions are taking place in Ukraine: at which stage I will not talk in detail," Zelensky said on Saturday, commenting after Russian President Vladimir Putin claimed that Kyiv's operation was already failing.

Russia has reported thwarting Ukrainian attacks in the east and south.

"It's interesting what Putin said about our counteroffensive. It is important that Russia always feels this: that they do not have long left, in my opinion," Zelensky said.

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He added that he was in daily touch with military commanders, including armed forces chief Valery Zaluzhny, and "everyone is positive now -- tell that to Putin!"

On Saturday, Kyiv's forces conducted counteroffensive operations in at least four front-line areas, according to the Washington-based think tank the Institute for the Study of War (ISW).

"Russian sources claimed that Ukrainian forces have tactical advantages in conducting assaults at night due to Western-provided equipment with superior night optics systems," ISW said.

To shore up that stockpile, Zelensky secured fresh pledges of military aid while meeting with visiting Canadian Prime Minister Justin Trudeau over the weekend.

Agence Frnace-Presse