The ceasefire will be very brief and during this period the militia must be disarmed and order must be restored in the region, he said.
"We will offer an amnesty to those who lay down arms and who have not committed grave crimes. I will offer a corridor for unarmed mercenaries to leave the territory of our country," Poroshenko said.
A key element of the peace plan is the draft constitutional amendments concerning profound power decentralization, the president continued.
"We expect many parties to this situation to demonstrate their support to this peace plan shortly. We expect the release of hostages, the immediate liberation of every occupied building and the choice of many people in the Donbas region to use the security guarantees," Poroshenko said.
The implementation of the peace plan is being thoroughly prepared, the president said.
"A major element of this plan is the closure of the state border. There is a huge risk that criminals may try to take advantage of the ceasefire," the Ukrainian president stated.
The peace plan stipulates 14 political steps, which will be announced within days, he said.