Ukrainian President Petro Poroshenko has warned that if the separatists do not abide by the ceasefire , he will impose martial law throughout Ukraine . A Ukrainian military official reported no violations of the ceasefire so far . Ukrainian forces and pro - Russian separatists are supposed to withdraw heavy weapons immediately .
A Ukrainian military official reported no violations of the ceasefire so far . Ukrainian forces and pro - Russian separatists are supposed to withdraw heavy weapons immediately .