The war in Ukraine can only be resolved through "diplomacy", President Volodymyr Zelensky has said.
Speaking on national TV, he suggested his country could be victorious against Russia on the battlefield, reports the BBC.
He added that the war could only come to a conclusive halt "at the negotiating table".
Meanwhile, heavy fighting is taking place in and around Severodonetsk, as Russian forces step up efforts to seize the whole of the Luhansk region.
The end of fighting in the southern port city of Mariupol has freed up Russian troops for redeployment elsewhere and allowed them to intensify their onslaught in the east.
Local governor Serhiy Haidai said the Russians were "destroying" Severodonetsk as they gradually surrounded it.
Writing on the messaging app Telegram, he said Ukrainian troops had repelled 11 attacks on the frontline - with eight tanks among the Russian vehicles destroyed.