"'What does not kill you makes you stronger.' These words of Friedrich Nietzsche, to my mind, fully reflects the essence of the current events in geopolitics," Petro Poroshenko said.

"Are we already living in the new world? I think we are not yet there. Could we go back to calm and stable, as we assumed, world order? No, we could not," he said.

Read alsoRussia test-launches intercontinental ballistic missileThe head of state went on to say that if "anybody thinks that when the war finally comes to an end in Ukraine (God let it be so), everything will be as it used to be, then he is absolutely wrong."

Read alsoMoscow analyst: Russia has made North Korea’s rocket program possible"You can’t bring tens of thousands of dead Ukrainians back to life. You can’t stitch together broken contracts. Dozens of Budapest Memoranda provide less security than one nuclear charge," the Ukrainian president said.