Sudan on Tuesday rejected an Ethiopian proposal for an initial agreement to approve the filling of a mega-dam it is building.
Sudanese Prime Minister Abdalla Hamdok said he could not sign the draft agreement because "it poses legal and technical problems that must be addressed".
Ethiopian Prime Minister Abiy Ahmed urged him to sign the agreement.
But Khartoum and Cairo fear the dam will trap their essential water supplies if Addis Ababa started to fill the reservoir in July.
Hamed Saleh, Sudan's chief negotiator in talks organised by the US, said Khartoum's concerns included long-term environmental and social effects.
Tension has been high in the Nile basin since Ethiopia broke ground on the project in 2011.
Addis Ababa says the dam is crucial for its economy, while Egypt fears it will disrupt the river that provides almost all of its water.
Sudan hopes the dam will provide much-needed electricity and help to regulate flooding.
The US Treasury Department and the World Bank stepped in as observers last year in talks between the three countries, after negotiations repeatedly failed.
"The only way to reach a comprehensive agreement is for all parties to go back to the negotiating table immediately," Mr Hamdok said.
The 6,600-kilometre Nile is a lifeline, supplying water and electricity to the 10 countries it crosses.
Its main tributaries, the White and Blue Niles, converge in the Sudanese capital Khartoum before flowing north through Egypt, then into the Mediterranean.
UAE currency: the story behind the money in your pockets
About Karol Nawrocki
• Supports military aid for Ukraine, unlike other eurosceptic leaders, but he will oppose its membership in western alliances.
• A nationalist, his campaign slogan was Poland First. "Let's help others, but let's take care of our own citizens first," he said on social media in April.
• Cultivates tough-guy image, posting videos of himself at shooting ranges and in boxing rings.
• Met Donald Trump at the White House and received his backing.
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The specs: 2017 Maserati Quattroporte
Price, base / as tested Dh389,000 / Dh559,000
Engine 3.0L twin-turbo V8
Transmission Eight-speed automatic
Power 530hp @ 6,800rpm
Torque 650Nm @ 2,000 rpm
Fuel economy, combined 10.7L / 100km
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Match info
Deccan Gladiators 87-8
Asif Khan 25, Dwayne Bravo 2-16
Maratha Arabians 89-2
Chadwick Walton 51 not out
Arabians won the final by eight wickets
Our legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants
Why are asylum seekers being housed in hotels?
The number of asylum applications in the UK has reached a new record high, driven by those illegally entering the country in small boats crossing the English Channel.
A total of 111,084 people applied for asylum in the UK in the year to June 2025, the highest number for any 12-month period since current records began in 2001.
Asylum seekers and their families can be housed in temporary accommodation while their claim is assessed.
The Home Office provides the accommodation, meaning asylum seekers cannot choose where they live.
When there is not enough housing, the Home Office can move people to hotels or large sites like former military bases.
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Engine: Electric motor generating 54.2kWh (Cooper SE and Aceman SE), 64.6kW (Countryman All4 SE)
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