"One of the basic options for getting out of this war is freezing the conflict along the front line," the advisor pointed out.

Ukrainian President Volodymyr Zelensky already made this statement this week, thus rejecting Russian demands to hand over the unoccupied parts of the Donetsk region to Moscow.

Ukrainian authorities insist that they cannot officially recognize the annexation of Ukrainian territories because it contradicts the country's constitution.

"This is not just a constitutional issue. This is a violation of an international ban. You cannot unilaterally return territory to an aggressor. We need to approach this issue a little differently," said Podoljaks.

"Ukraine's provisional position is as follows - we understand that one of the main options for getting out of this war is to freeze the conflict along the front line," the adviser stated.

"These are territories that are currently 'de facto' occupied by Russia. They will remain so. And then significant efforts will be made - through economic, diplomatic and other means - to return these territories to Ukraine. However, 'de iure' they will remain the territory of Ukraine," Podoljak added.

Russian dictator Vladimir Putin told US President Donald Trump during a summit in Alaska on Friday that he was ready to freeze the front in the Kherson and Zaporizhia regions if Ukraine leaves the Donetsk region, Western media reported, citing sources.

Trump later presented Putin's idea to Zelensky, but the Ukrainian president rejected the proposal.

The Ukrainian-controlled part of Donetsk Oblast contains several fortified areas.