It is unacceptable for Ukraine to yield any of its territory, including part of Donbas, says Ukrainian President Petro Poroshenko.

"Some political leaders have just said that we should build a new wall, to isolate part of the Donetsk and Luhansk regions, which are part of Ukraine's sovereign territory, and yield our land to the enemy. To me, the idea of squandering Ukrainian lands is unacceptable," Poroshenko said, in introducing a new head of the Kyiv regional administration on Wednesday.

"On the contrary, we should unite and fight for Ukraine's return to Donbas," he added.