DUBAI, July 27 (Xinhua) -- The United Arab Emirates (UAE) top diplomat on Friday dismissed Qatar's demand for a Washington summit on the current Gulf crisis as "wishful thinking."

Earlier this week, Qatari Emir Tamim bin Hamad Al Thani paid a two-day visit to Britain, where he asked for a U.S.-sponsored summit to solve the Gulf crisis that erupted in June 2017.

"Through my conversation with some observers, it appears the visit of the Qatari emir to Britain is dim ... Tamim looked weak in his attitude toward the Iranian issue and pessimistic about the crisis of his country," said UAE Minister of State for Foreign Affairs Anwar Gargash on his Twitter account.

By demanding a summit in Washington, Qatar tried to convince its citizens of an upcoming breakthrough in the crisis, he added.

Saudi Arabia, the UAE, Bahrain and Egypt have severed ties with Qatar economically by imposing a trade, land and air traffic embargo since June 2017.

The Arab quartet accuse Qatar of supporting terrorism and aligning with non-Arab Gulf state Iran against pan-Arab interests.

As allies of both Qatar and the Arab quartet, Britain and the U.S. have offered to mediate between the disputing parties in an attempt to end the Gulf crisis.