Fighting between government troops and the separatists has been raging in eastern Ukraine since 2014, killing more than 9,800 people.
A 2015 peace deal brokered by France and Germany has helped reduce the scale of fighting, but violence has continued while attempts to broker a political settlement have failed.
Poroshenko met with German Chancellor Angela Merkel today and said Ukraine, Germany and France would renew efforts to strengthen the peace deal.
The president's spokesman, Svyatoslav Tsegolko says Poroshenko has ordered a cease-fire for the armed forces starting April 1.
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