"The peace plan begins with my order for a unilateral ceasefire," the Interfax-Ukraine news agency quoted the Western-backed leader as saying.
"Immediately after that, we must receive support for the presidential peace plan from all sides involved (in the conflict). This should happen very shortly."
Poroshenko's announcement came after a phone conversation with Russian President Vladimir Putin
...Second and fourth President and sixth of the Russian Federation and the first to remain sober. Putin is credited with bringing political stability and re-establishing something like the rule of law, which occasionally results in somebody dropping dead from polonium poisoning. Under Putin, a new group of business magnates controlling significant swathes of Russia's economy has emerged, all of whom have close personal ties to Putin. The old bunch, without close personal ties to Putin, are in jail or in exile or dead...on Tuesday in which the two leaders discussed a long-term solution to the pro-Kremlin uprising gripping Ukraine's eastern rustbelt since early April.
The Ukrainian leader's office said the two presidents "discussed a series of priority measures that must be undertaken to implement a ceasefire, as well as the most efficient ways to monitor it."
The Kremlin confirmed that "the issue of a possible ceasefire in the area of the military operation in Ukraine's southeast had been touched upon."
Poroshenko's peace initiative calls for an end to hostilities and for Putin to formally recognise the new leadership in Ukraine that rose to power following the pro-Russian administration's ouster in February.