The ceasefire in eastern Ukraine remains in limbo one week after it came into effect. The Ukrainian military says it cannot withdraw heavy weaponry from the front line because of continued rebel violence. The rebels took the strategic town of Debaltseve last week, several days after the truce began, but deny carrying out further attacks. On Sunday, two people were killed when a bomb hit a rally in Kharkiv marking the one-year anniversary of the killing of demonstrators in the Maidan protests that topped President Viktor Yanukovych. The Ukraine government says it’s arrested four suspects tied to Russia. Thousands also marched in Kiev, while a parallel rally was held in Moscow to denounce the Maidan anniversary. Despite the continued unrest, fighting has stopped in several areas, and the Ukrainian military and rebels have exchanged dozens of prisoners.