President Bashar al-Assad warned Syria's Kurds Sunday that their ally the United States would not protect them against any Turkish offensive as Washington looks to withdraw it troops.

A top US general warned on Tuesday that Islamic State would pose an enduring threat following a planned US withdrawal from Syria, saying the militant group retained leaders, fighters, facilitators and resources that will fuel a menacing insurgency.

President Donald Trump announced in May that Washington was pulling out of the deal, which lifted international sanctions against Tehran in exchange for restrictions on Iran's nuclear activities.

Iran's top diplomat on Friday praised the country's remaining partners in a landmark 2015 nuclear deal for their "will to resist" US pressure after Washington withdrew from the deal in May.

The 2015 agreement between Iran and world powers lifted international sanctions on Tehran.

"The US withdrawal ... is a violation of morals, the correct way to carry out politics and diplomacy and against international regulations," Rouhani during a meeting with visiting Sri Lanka President Maithripala Sirisena.

The Khalid bin Abdullah al-Attiyah Roundabout in western Doha will be closed for more than two years starting September 10.