Israel became the first country to formally recognise the self-declared Republic of Somaliland as an independent and sovereign state on Friday -- a decision that could reshape regional dynamics and test Somalia's longstanding opposition to secession.

Prime Minister Benjamin Netanyahu said Israel would seek immediate cooperation with Somaliland in agriculture, health, technology and the economy. In a statement, he congratulated Somaliland's president, Abdirahman Mohamed Abdullahi, praised his leadership and invited him to visit Israel.

Netanyahu said the declaration "is in the spirit of the Abraham Accords, signed at the initiative of President Trump."

The 2020 accords were brokered by Trump's first administration and included Israel formalising diplomatic relations with the United Arab Emirates and Bahrain, with other countries joining later.

Netanyahu, Foreign Minister Gideon Saar and Somaliland's president signed a joint declaration of mutual recognition, the Israeli statement said.

Abdullahi said in a statement that Somaliland would join the Abraham Accords, calling it a step toward regional and global peace. He said Somaliland was committed to building partnerships, boosting mutual prosperity and promoting stability across the Middle East and Africa.

But Somalia's government condemned Israel's move as an "unlawful step" and a "deliberate attack" on its sovereignty, rejecting any recognition of Somaliland, according to a statement from the prime minister's office.

"The federal government affirms its determination to pursue all necessary diplomatic, political, and legal measures, in accordance with international law, to defend its sovereignty, unity, and internationally recognized borders," the statement said.

Egypt said Foreign Minister Badr Abdelatty held phone calls on Friday with his counterparts from Somalia, Turkey and Djibouti to discuss what they described as dangerous developments in the Horn of Africa following Israel's announcement.

The ministers condemned Israel's recognition of Somaliland, reaffirmed their full support for Somalia's unity and territorial integrity, and warned that recognising breakaway regions posed a threat to international peace and security, Egypt's foreign ministry said.

The African Union also rejected any recognition of Somaliland, reaffirming its "unwavering commitment" to Somalia's unity and territorial integrity and warning that such moves risked undermining peace and stability across the continent, the AU Commission chair said.

Somaliland has enjoyed effective autonomy - and relative peace and stability - since 1991 when Somalia descended into civil war, but the breakaway region has failed to receive recognition from any other country.

Over the years, Somalia has rallied international actors against any country recognising Somaliland.

The former British protectorate hopes that recognition by Israel will encourage other nations to follow suit, increasing its diplomatic heft and access to international markets.

In March, Somalia and Somaliland denied receiving any proposal from the United States or Israel to resettle Palestinians from Gaza, with Mogadishu saying it categorically rejected any such move.