On June 29, European Union leaders held talks with Ukrainian and Russian Presidents.
The telephone conference between President Francois Hollande, German Chancellor Angela Merkel, Russia's Vladimir Putin, and Ukrainian President Petro Poroshenko lasted more than two hours.
The French presidency said the leaders discussed "the importance of making new concrete advances in the security situation on the ground, prolonging the cease-fire, and putting in place the peace plan" presented by Ukraine, RFE/RL reports.
The Kremlin said the four leaders called on Poroshenko to extend the truce in eastern Ukraine, which is due to end on June 30 at 22:00 local time.
A statement from Poroshenko's office said he had called on Putin to strengthen Russian control over its borders to prevent militants and arms entering Ukraine.
The conversation comes after reports of renewed clashes in eastern Ukraine, where five soldiers were killed and at least 17 injured at the weekend.