"The issue of separating off the Donbas is a provocation. As the president and the Supreme Commander, as the guarantor of the Constitution, I’m a guarantor of the territorial integrity of Ukraine. I will never allow the holding of a referendum on the separation of the Donbas [from Ukraine]," Poroshenko said.

"As for the regime of local government - if it requires constitutional changes, there is a corresponding constitutional procedure, including a referendum. And as the guarantor of the Constitution, I will ensure the free will of citizens so that all Ukrainians will have an opportunity to express how they see the future of the Donbas - but only as a part of Ukraine," Poroshenko said.