Ukrainian President Petro Poroshenko has said he believes that the semi-presidential form of government is optimal for Ukraine and that he will not ask for more powers as president.

"The current form of government that we have is optimal for Ukraine," Poroshenko said during his speech to graduates of the National University of "Kyiv-Mohyla Academy" on Friday.

He also noted that the parliamentary system is currently "problematic due to the [Russian] aggression and powerful, long-term military threat against Ukraine."

According to Poroshenko, one can't oppose such challenges without a president – a Supreme Commander with sufficient authority.

"And I'm satisfied with what the Constitution gives and won't ask for more, as previous president has done," Poroshenko said.

He said that despite some within the country saying that the presidential system would be more efficient under present circumstances, during the Revolution of Dignity the Ukrainian people clearly said that there could be no totalitarianism.

"Blown out of proportion, the power of presidents in post-soviet countries became a sign of totalitarianism. And we made a decisive and irreversible step out of this non-democratic reservation," Poroshenko said.