The UAE’s Minister of State for Foreign Affairs Anwar Gargash said Abu Dhabi wants to normalise relations with Turkey.
Bahrain on Monday became the last of the former Gulf blockading countries to lift its embargo on Qatar.
The first commercial flight between Qatar and Saudi in three and a half years is due to take off on Monday
Sudan warned it cannot continue the "vicious cycle" of negotiations with Egypt and Ethiopia in the long-running dispute over Addis Ababa's controversial Blue Nile mega dam.
Drivers who arrived at the Salwa border crossing in Saudi Arabia from the Qatari land crossing at Abu Samrah were welcomed with roses.
Saudi shut its side of Qatar's only land border in June 2017 as part of a package of sanctions on Doha.
The Green Italy party has said it will file a legal complaint over the government's continued arms sale to Egypt despite the murder of an Italian student.
Abu Dhabi will open land, sea and air entry points with Qatar, after a landmark deal to normalise ties ended a damaging Gulf rift.
Qatar Airways will fly over Saudi Arabia for the first time since the Gulf crisis.
With infections hitting record levels, Lebanon is entering a 25 day lockdown, to stop hospitals becoming overwhelmed.