The Kurdish-led group which governs northeast Syria on Friday rejected a constitutional declaration issued by the new Islamist leadership in Damascus and called for it to be rewritten.

The militia alliance that controls much of north-eastern Syria will merge with new state institutions, the presidency says.

Syria’s interim government says it has reached a landmark agreement with Kurdish-led forces to integrate them into state institutions as it tries to unify the country’s diverse communities after a decade of civil war.

The agreement marked a major victory for Damascus in its quest to unify the country, as violent unrest continues to grip Syria’s coastal region.

Turkish President Tayyip Erdogan welcomed an agreement between the Kurdish-led and U.S.-backed Syrian Democratic Forces and Syria's new government, saying all Syrians stood to gain from the deal. "The full implementation of the agreement reached yesterday in Syria will contribute to the country’s security and stability.

Syria's interim government said it has reached a landmark agreement to integrate Kurdish-led forces into state institutions as it continues to try to unify the country following years of civil war.

Turkey is "cautiously optimistic" about an agreement between the Kurdish-led and U.S.-backed Syrian Democratic Forces (SDF) and Syria's new government, a Turkish official said on Tuesday, adding Ankara wanted to first see how it would be implemented.

Syrians from around the country celebrated an agreement signed by interim President Ahmed Al-Sharaa with the Syrian Democratic Forces to join new state institutions. The accord comes at a critical moment as Sharaa grapples with the fallout from deadly clashes between Syrian forces and militants loyal to ousted President Bashar al-Assad.