'Our position is clear:' Zelenskyy and EU dismiss ceding Ukrainian land to Russia

"The constitution of Ukraine makes it impossible to give up territory or trade land," Zelenskyy said during a press conference at the European Commission on Sunday. 

He added that Russia has repeatedly tried and failed to seize the entirety of the Donbas region in eastern Ukraine for a period of 12 years. The Donbas, which includes Donetsk and Luhansk oblasts, is an industrial hub, with coal mining and steel production central to Ukraine's economy.

"Since the territorial issue is so important, it should be discussed only by the leaders of Ukraine and Russia at the trilateral [talks with] Ukraine, United States, Russia," Zelenskyy said.

"With regards to any territorial questions in Ukraine, our position is clear: international borders cannot be changed by force. These are decisions to be made by Ukraine and Ukraine alone, and these decisions cannot be taken without Ukraine at the table," von der Leyen said.

"All the president is trying to do here is narrow down the open issues," Rubio said, adding that Trump is focused on ending the Kremlin's war in Ukraine.

"You can't have a peace deal between two warring factions unless both sides agree to give up something. And both sides agree that the other side gets something. Otherwise, if one side gets everything they want, that's not a peace deal. It's called surrender. And I don't think this is a war that's going to end anytime soon. On the basis of surrender," Rubio said.