Poroshenko wrote on Facebook, Censor.NET reports.
"I sign up with the German and French leaders in urging, first of all, President of Russia as aggressor in the conflict to secure full cease-fire with the beginning of the school year.
"On my part, I ordered the Armed Forces of Ukraine to continue to observe the declared cease-fire.
"The issue have been examined with the commanders of the Ukrainian Army during my today's visit to Kramatorsk.
"We strongly believe the cease-fire must be universal to promote the peacemaking process of restoring Ukraine's sovereignty and territorial integrity," the president wrote.
Merkel and Macron issued a statement on Monday, Aug. 28, and urged Ukraine and Russia to abide by the cease-fire in the Donbas.