During a phone conversation with European Commission President Jean-Claude Juncker, "the parties... Confirmed that the Ukraine-EU summit would be held on April 27," a statement on Poroshenko's official website said.
The holding of annual summits was set down in the association agreement signed by the EU and Kiev's pro-western government after it came to power in June 2014.
That followed the fall of the pro-Russian president Viktor Yanukovych in February 2014, who left the country following three months of bloody protests sparked by his decision to suspend preparations for the signing of the EU agreement.
The April summit is expected to address Poroshenko's request for European peacekeepers to help monitor a truce signed last month between Kiev and pro-Russian separatists in the east, aimed at ending nearly a year of fighting.
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Officials will also discuss a possible aid boost for Ukraine's struggling economy, the statement said.
The European Parliament on Wednesday formally approved new economic aid worth USD 2 billion for Ukraine, two-thirds of which could be disbursed by the end of the 2015.
Both Juncker and European Council President Donald Tusk are expected to attend, as well as EU heads of state and government, according to reports.