CAIRO – Egypt wants the United Nations Security Council to “undertake its responsibilities” and prevent Ethiopia from starting to fill its massive, newly built hydroelectric dam on the Nile River next month amid a breakdown in negotiations, Egyptian Foreign Minister Sameh Shukry told The Associated Press on Sunday, accusing Ethiopian officials of stoking antagonism between the countries.Ethiopia announced Friday that it would begin filling the dam’s reservoir in July even after the latest round of talks with Egypt and Sudan failed last week to reach a deal governing how the dam will be filled and operated.