CAIRO: Egyptian President Abdel Fattah el-Sisi has issued a fresh warning against unilateral control of Nile waters, declaring that any attempt to force Egypt to accept decisions threatening its water security would fail. The warning, delivered on Sunday during the opening of the ninth Cairo Water Week, appeared directed at Ethiopia amid the longstanding dispute over the Grand Ethiopian Renaissance Dam (GERD), which Addis Ababa has developed on the Blue Nile despite.