“Interlocutors discussed situation in Donbas and expressed concern about the events unfolding around Debaltsevo,” the statement published on Poroshenko’s official website read.
“The President of Ukraine stressed the necessity of OSCE monitoring to confirm the ceasefire. Petro Poroshenko and Barack Obama also agreed on further coordination of efforts in case of escalation,” the statement concluded.
Poroshenko, German Chancellor Angela Merkel and French President Francois Hollande also held phone talks earlier on Saturday.
The ceasefire was one out of the measures agreed on during the last reconciliation talks on Ukraine in the Belarus capital of Minsk.
The leaders of Ukraine, France, Germany, and Russia held a 16-hour summit in Minsk on Wednesday and early Thursday. The talks resulted in a new political deal, aimed at stopping the deadly conflict in eastern Ukraine.
The deal was signed by the Contact Group on Ukraine, including envoys from Moscow, Kiev, the self-proclaimed people's republics of Donetsk and Luhansk and the Organization for Security and Co-operation in Europe (OSCE).
Despite a similar ceasefire agreement signed by the parties in last September, clashes in eastern Ukraine intensified in the first weeks of 2015.