Turkish army announced on Tuesday that Ankara and Doha “successfully” concluded joint military trainings, amid an unprecedented diplomatic crisis between the small emirate and its Gulf neighbors.

Turkey's President Tayyip Erdogan left Qatar on Monday after two days in the Gulf trying to mediate in the worst row among Arab states for years but there was no sign he had made any progress.

Turkish President Tayyip Erdogan heads to the Gulf this weekend in an attempt to patch up the rift between Qatar and its neighbors, but the firm Qatari ally may find himself with little room to maneuver as a mediator.

Turkey’s President Tayyip Erdogan is planning to visit Saudi Arabia, Kuwait and Qatar on July 23-24, the Turkish presidency said on Tuesday.

Saudi Arabia's defense minister, Crown Prince Mohammed bin Salman, discussed military ties in a telephone call with his Turkish counterpart, Saudi state news agency SPA reported, after a new contingent of Turkish troops arrived in Qatar.

Qatar said on Tuesday more Turkish troops had arrived at a military base in Doha after Ankara fast-tracked legislation last month for more soldiers to be deployed there.

President Tayyip Erdogan on Wednesday reaffirmed Turkey's support for Qatar in its dispute with four other Arab states, saying their demands against the tiny Gulf nation were unacceptable.

U.S. president Donald Trump spoke with Turkish President Tayyip Erdogan on Friday to discuss the dispute between Qatar and Gulf and Arab powers who severed diplomatic and travel links with Qatar.

resident Tayyip Erdogan on Sunday dismissed calls for Turkey to close a military base in Qatar and said a wider list of demands issued by four Arab states was an unlawful intervention against the Gulf state's sovereignty.

Turkey rejected a call from four Arab states on Friday to shut down its military base in Qatar, saying the base was a guarantor of security in the Gulf and demands for its closure represented interference in its ties with Doha.

Turkish troops have taken part in long-planned joint military exercises in Qatar, military sources and al Jazeera television reported on Monday, following a diplomatic rift between Doha and four other Arab states.

Turkish President Tayyip Erdogan held a teleconference call with French President Emmanuel Macron and Qatari Emir Sheikh Tamim bin Hamad al-Thani to discuss the Qatar crisis, Turkish presidential sources said on Friday.

The Ministry of Foreign Affairs explained that the Memorandum of Understanding (MoU) between the governments of the Kingdom of Bahrain and the Turkish Republic on mutual exemption from visa fees for holders of ordinary passports, which was signed on February 12, will go into effect on June 24.

Turkish Foreign Minister Mevlut Cavusoglu on Thursday held talks in Kuwait to push mediation efforts aimed at resolving a standoff between a Saudi-led alliance and Qatar.

Turkey is not taking sides in a dispute between Qatar and its Gulf Arab neighbours, Turkey's foreign minister said on Thursday during a Gulf tour, according to Arabic media reports.

Turkey expects Saudi Arabia's King Salman to lead an effort to resolve the Qatar crisis, Turkish Foreign Minister Mevlut Cavusoglu said on Thursday, adding that imposing sanctions and embargoes would not help remedy the situation.

Turkish Foreign Minister Mevlut Cavusoglu on Thursday held talks in Kuwait to push mediation efforts aimed at resolving a standoff between a Saudi-led alliance and Qatar.

US Secretary of State Rex Tillerson has said the classification of the Muslim Brotherhood in its entirety as a "terror" group complicates the security and politics of the Middle East.

Turkey, a strong ally of Qatar, will send its foreign minister to Doha on Wednesday and then if possible to Saudi Arabia in a diplomatic push to help end a bitter feud between the emirate and a number of other Arab countries.

Turkish President Tayyip Erdogan on Tuesday denounced the isolation of Qatar by neighboring states as a violation of Islamic values and akin to a "death penalty" imposed in a crisis that has reverberated across the Middle East and beyond.