(Adds a Sudanese statement)
KINSHASA/CAIRO, April 6 (Reuters) - Egypt and Sudan said on Tuesday that the latest round of talks with Ethiopia over the Grand Ethiopian Renaissance Dam (GERD) in Kinshasa have ended with no progress made.
Delegations from the three countries were meeting in the Democratic Republic of Congo hoping to break a deadlock in negotiations over a project Ethiopia says is key to its economic development and power generation.
Egypt fears the dam will imperil its supplies of Nile water, while Sudan is concerned about the dam's safety and water flows through its own dams and water stations.
Before the meetings began, Egypt had said they represented the last chance to re-start negotiations before Ethiopia begins to fill the dam for the second year in a row after seasonal rains begin this summer.
Sudan's foreign minister Mariam al-Sadig al-Mahdi told reporters on Tuesday that Ethiopia's insistence on such unilateral moves represents a violation of international law.
"This Ethiopian intransigence requires Sudan to consider all possible options to protect its security and its citizens," the Sudanese irrigation and water resources ministry said in a statement.
Ethiopian water minister Seleshi Bekele did not respond to texts and calls seeking comment.
Sudan and Egypt were aligned on a proposal to include the European Union, United States and United Nations in the negotiations, as an addition to current African Union mediators.
Both countries said Ethiopia rejected the proposal during the meeting, as well as other suggestions to re-start negotiations.
"This position reveals once again Ethiopia's lack of political will to negotiate in good faith," Egyptian foreign ministry said in a statement.
Sudan, which is also locked in a border dispute with Ethiopia, had hosted Egypt for air force training exercises that concluded on Saturday.
Last week, Egypt's President Abdel Fattah al-Sisi said there would be "inconceivable instability in the region" if Egypt's water supply were affected by the dam.
"Without a new approach to negotiations, there becomes space for Ethiopia to impose a fait accompli and put all the peoples of the region in grave danger," said al-Mahdi. (Reporting by Hereward Holland in Kinshasa, and Mahmoud Mourad, Nadine Awadalla, and Nafisa Eltahir in Cairo, and Khalid Abdelaziz in Khartoum; Editing by David Goodman and Jonathan Oatis)