"Unity and solidarity - this is what we expect from the EU. All this is equally important for our aspirations for reform and our struggle against the Russian aggression," Poroshenko said.
According to him, Europe will only benefit from a strong Ukraine.
Poroshenko also called for the extension of economic sanctions against the Russian Federation.
"Sanctions are very important. I believe that during the summit we'll get confirmation that they should continue until the territorial integrity of Ukraine is restored, including Crimea," Poroshenko said.
According to the Ukrainian president, the EU-Ukraine summit also has a "strategic importance."
"We are approaching the summit with certain expectations. There is a mutual understanding of how the association agreement with the EU may be ratified. I hope that during the EU summit in December a long-awaited breakthrough on the issue will be made," Poroshenko stressed.
The Ukrainian leader also said he expected the European Union to grant Ukraine visa waiver.
Earlier, U.S. President Barack Obama and leaders of five European Union countries - German Chancellor Angela Merkel, French President Francois Hollande, Italian Prime Minister Matteo Renzi, the Spanish Prime Minister Mariano Rajoy and British Prime Minister Theresa May agreed to maintain sanctions against Russia until it fully meets its commitments under the Minsk agreements.