US says Ukraine deal 'potentially significant'

The United States cautiously welcomed a brokered ceasefire in the 10-month war between Ukraine and pro-Moscow rebels Thursday, but insisted the deal must be implemented and honored. "The agreement represents a potentially significant step toward a peaceful resolution of the conflict and the restoration of Ukraine's sovereignty," the White House said in a statement. The deal was negotiated between leaders of Germany, France, Russia and Ukraine after marathon talks that ended early