Gulf countries broke a three-year-old embargo with Qatar and an agreement aimed at ending Arab countries including Saudi Arabia ends to close their rift.

The agreement is due to be signed in Saudi Arabia, a senior Trump administration official said.

This development is the latest in a series of Middle East deals sought by Washington and others involving Arab states and Israel, aimed to be a united front against Iran.

Saudi Arabia will reopen its airspace, land, and sea borders to Qatar as of Monday, Kuwaiti Foreign Minister Ahmad Nasser al-Sabah said on Kuwait TV.

Saudi’s ruler Crown Prince bin Salman was quoted by the Saudi state agency (SPA) saying the annual gathering of Gulf leaders would unite Gulf ranks “in the face of challenges facing the region”.

Emir Sheikh Tamim bin Hamad Al- Thani, will attend the royal court, according to Reuters, the Saudi crown prince and Emir of Qatar will sign the deal.

Saudi Arabia, UAE, Egypt, and Bahrain imposed trade and travel sanctions on Qatar in 2017, accusing the country of supporting terrorism, but Qatar denied the claims.

Qatar will suspend lawsuits related to the barriers according to the agreement, officials told Reuters.

Countries involved in the deal are all American allies, Qatar, Bahrain, and Saudi Arabia and the UAE hosts American military bases.