Ukrainian government forces and the pro-Russian separatist rebels fighting them in eastern Ukraine will observe a cease-fire starting Friday, negotiators from all sides announced at a news conference in Minsk, Belarus.
However, the strength of the truce was immediately called into question by continued fighting around Mariupol, a port city in southeastern Ukraine.
Speaking from Minsk, negotiators representing the Ukrainian government, the separatists, Russia and the Organization for Security and Cooperation in Europe said that the cease-fire was due to come into force at 6 p.m. local time.

Source: NYT