Egypt, Sudan and Ethiopia said Sunday they would resume talks this week over a contentious, massive Nile dam, even as Egypt accused Ethiopia of trying to hinder progress on a resolution to disagreements over the project. The construction of the $4.6 billion Grand Ethiopian Renaissance Dam on the Blue Nile, which is over 70% complete and promises to provide much-needed electricity to Ethiopia’s 100 million people, has been a friction point between Ethiopia, Sudan and Egypt, the three main Nile Basin countries.