Eritrea has angrily dismissed an accusation from its long-time foe Ethiopia that it is in material breach of the Algiers Agreement.
The treaty ended their brutal two-year war in 2000 and set up a commission that redrew the disputed border.
Eritrea's information minister told the BBC that the warning was "irrelevant".
If Ethiopia did pull out of the treaty, it might imply that it would no longer comply with the commission's ruling that Badme be awarded to Eritrea.
"Eritrea has nothing to do on this issue and as far as Eritrea is concerned, everything that has been said is irrelevant," Eritrean Information Minister Ali Abdu told the BBC.
TENSE BORDER
"The Eritrea Ethiopia Boundary Commission is entitled and mandated to demarcate the border, but the Ethiopian regime is refusing to abide by the rule of law," he said.
The BBC's Peter Martell in the capital, Asmara, says Eritrea also denies backing terrorist groups targeting Ethiopia, claiming such accusations are a smokescreen for Ethiopia to divert attention from its failure to accept the border ruling.
Earlier this month, Eritrea said that it would pull back thousands of troops from the officially demilitarised border buffer zone; lift restrictions on United Nations peacekeepers and a ban on helicopter flights if Ethiopia agreed to enforce its end of the border ruling.
But Ethiopia says occupying the demilitarised zone and restricting the movement of the UN amounts to a material breach of the treaty.
Ethiopian foreign ministry sources stress that the letter, copied to the UN Security Council, is merely a formal notification, and the desired outcome would be for Eritrea to return to compliance so that no further action would follow.
Our correspondent says with the boundary commission due to close in November tensions are rising, adding to fears of a return to war.
Eritrea, which won its independence after a 30 year liberation struggle from Ethiopia, knows how bad war can be, and has said it will do everything in its power to avoid it, our reporter says.
But it has also stressed that it will not tolerate any infringement on its sovereignty or territorial integrity.
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