NEW : Ukrainian President 's office : Cease-fire is extended 72 hours . Ukraine 's Petro Poroshenko : `` We do not expect any immediate negative reaction , '' he said . EU document is `` a symbol of faith and unbreakable will '' The signing shows `` how dramatically things can change in a short time , '' he says . State media : " A new era has begun for the people of Ukraine.
NEW : Ukrainian President 's office : Cease-fire is extended 72 hours . Ukraine 's Petro Poroshenko : EU document is `` a symbol of faith and unbreakable will '' The signing shows `` how dramatically things can change in a short time , '' he says . State media : " A new era has begun for the people of Ukraine.