Kuwaiti Foreign Minister Sheikh Sabah Al Khaled Al Sabah said in a statement carried by the state-run KUNA news agency Sunday that unity among Gulf Arab countries "was paramount to the people of the region".
The three countries' news agencies did not make clear what services the hotline would provide.
Qatar's neighbors have also criticized Qatar for allegedly supporting groups like the Muslim Brotherhood and Hamas.
On June 6, Reza Nourani, head of the National Union of Iran's Agricultural Products, said arrangements have been made with local freight companies for exporting food shipments to Qatar, adding that three southern ports of Bandar Abbas, Bushehr, and Bandar Lengeh are geared up to ship out food.
Qatar meanwhile pledged those nations' citizens will have "complete freedom" to stay in the energy-rich country.
It gave the example of a Saudi man, a resident of Doha with his Qatari wife and children, who had been unable to visit his sick mother hospitalized in Saudi Arabia because he would be blocked from returning to his family.
It has created chaos across the Sunni Gulf nations, whose citizens conduct business across countries sharing long historic and cultural bonds.
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The statement underscored the UAE's commitment to the well being of the brotherly Qatari people as a natural extension of the brotherly UAE people.
Qatar, a small peninsular nation of 2.5 million people, was importing 80 per cent of its food requirements from bigger Gulf Arab neighbours before they cut ties with it.
Saudi Arabia has also closed its land borders with Qatar, geographically isolating the tiny Gulf state.
In recent days, Turkey has stepped in to supply supermarkets there with eggs and milk after anxious residents cleaned out shelves in the early days of the crisis.
"So far five planes carrying. vegetables have been sent to Qatar, each carrying around 90 tones of cargo, while another plane will be sent today", Iran Air spokesman Shahrokh Noushabadi said. "We have to stop the funding of terrorism. the time had come to call on Qatar to end its funding they have to end that funding and its extremist ideology in terms of funding", said the US President.
While Tillerson and others have called for an easing of tensions, Trump on Friday said Qatar had "historically been a funder of terrorism at a very high level".
Referring to Mr Tillerson's comments on the blockade of Qatar, Mr Erdogan said in a speech at a Ramadan fast-breaking dinner in Istanbul: "I say it should be lifted completely".
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