Lebanese President Michel Aoun on Thursday signed a letter approving a landmark US-brokered agreement laying out the country's maritime boundary with Israel, Lebanon's top negotiator told reporters.
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Israel followed suit in approving the deal, which marks a diplomatic departure from decades of hostility.
The agreement opens the way for offshore energy exploration and removes one source of potential conflict between Israel and Iranian-backed Lebanese terrorist group Hezbollah and could help alleviate Lebanon's economic crisis.
Speaking from the presidential palace, negotiator Elias Bou Saab said the agreement marked the beginning of "a new era" and that the letter would be submitted to US officials at Lebanon's southernmost border point of Naqoura later on Thursday.
Hailed by all three parties as a historic achievement, the deal will be signed separately in Jerusalem by Israeli Prime Minister Yair Lapid following his cabinet's approval.
Asked what happens in case of a violation by either of the sides, which remain technically at war, US envoy Amos Hochstein said the US would remain a guarantor to help resolve any disputes.
"If one side violates the deal, both sides lose," Hochstein told reporters.
An offshore energy discovery - while not enough on its own to resolve Lebanon's deep economic problems - would be a major boon, providing badly needed hard currency and possibly one day easing crippling blackouts.
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