Arab states boycotting Qatar could resume travel and trade links with Doha within a week under a United States-backed deal, but restoring diplomatic ties requires more time as parties work to rebuild trust, a United Arab Emirates (UAE) official said on Thursday.

Gulf powerhouse Saudi Arabia announced the breakthrough in ending a bitter dispute at a summit on Tuesday, with its foreign minister saying Riyadh and its allies would restore all ties with Doha severed in mid-2017.

UAE Minister of State for Foreign Affairs Anwar Gargash told a virtual news conference that measures to be implemented within a week of the agreement “include practical measures of airlines, shipping and trade”.

However, he said, other issues such as restoring full diplomatic relations would take time with differences remaining, including over geopolitical issues such as Turkey and Islamist groups like the Muslim Brotherhood.

“Some issues are easier to fix and some others will take a longer time,” Gargash said. “We have a very good start [...] but we have issues with rebuilding trust.”

Saudi Arabia, the UAE, Bahrain and Egypt imposed the embargo on Qatar over allegations that it supports terrorism and is cosying up to foe Iran. Doha denies the charges and says the boycott aims to curtail its sovereignty.

Kuwait and the United States have been mediating in the dispute that Washington says hampers efforts to contain Iran.

Sources familiar with the matter told Reuters that the Trump administration and Riyadh had pressed the other boycotting states to sign the deal and that Saudi Arabia would move faster than its allies to restore ties.

Discussions continued even after the deal was signed at the summit in the kingdom on Tuesday to offer reassurances, a source familiar with knowledge of the matter told Reuters on Thursday.