British Foreign Secretary Dominic Raab joined his US and EU counterparts on Wednesday in welcoming the Al Ula Declaration and final communique of the six member Gulf Cooperation Council.
"The UK has long encouraged all parties to find a resolution to this dispute. The GCC is our third largest export market outside of the EU and we look forward to continued collaboration with all our friends in the Gulf to strengthen our shared security and prosperity interests," Mr Raab said.
"Yesterday’s GCC Summit announcement is a significant development on the path to restoring Gulf unity. I pay testament to Kuwaiti mediation efforts, and urge the parties to continue building on this positive dialogue."
Mike Pompeo, the US Secretary of State, also issued a statement on the meeting, which marked the 40th anniversary of the signing of the organisation's Charter in Abu Dhabi.
"We have long stressed that a truly united Gulf will bring added prosperity through the free flow of goods and services and more security to its people. We welcome the pledge today to restore co-operation in military, economic, health, counter-corruption and cultural initiatives," Mr Pompeo said.
"We hope the Gulf countries will continue to reconcile their differences."
Restoring full diplomatic relations was imperative for all parties in the region to unite against common threats, he said.
"We are stronger when we stand together," Mr Pompeo said.
"The United States thanks Kuwait for its mediation efforts and support in resolving the Gulf dispute."
Meanwhile, Europe's top diplomat also said there was a turning of the corner in the Qatar crisis and that unity could foster progress.
"The European Union welcomes these significant developments as they will considerably strengthen regional stability and restore GCC unity and cooperation in full," officials working for Josef Borrell, the high representative for foreign affairs said.
"We commend in this respect the mediation role played by Kuwait all along, as well as by the US.
"The EU stands ready to support further regional integration within the Gulf Cooperation Council and to strengthen its long-standing partnership with the GCC."