Ukrainian President Petro Poroshenko vows to submit a bill repealing Ukraine's non-aligned status to the Verkhovna Rada upon returning to Ukraine from a visit to Warsaw.

"Immediately upon returning to Ukraine, I will submit a bill on repealing our non-aligned status to the parliament for consideration," Poroshenko said in a speech to the Polish Sejm and Senate on Wednesday.

Ukraine will intensify cooperation with NATO as much as possible and will seek compliance with the alliance's defense and security standards, he said.

"A huge amount of work has to be done to achieve membership criteria. I also have to work hard to hold a referendum so that only the Ukrainian people rather than our neighbors determine the direction of our further development," Poroshenko said.