"Qatar has been an impartial diplomatic mediator in resolving crises and disputes between brotherly and friendly countries and will continue to be a major player in the worldwide community", the ministry said in a statement.
Saudi Arabia's foreign minister, talking to reporters during a news conference in Washington on Tuesday with U.S. Secretary of State Rex Tillerson, said Riyadh was ready to send food and medical supplies to Qatar.
He said that Qatar has "practically been sentenced to the death penalty" and added that "it is neither humane nor Islamic to attempt to isolate a country's people in every area from food, to drink, to travel, to commerce, to worship".
The minister, Adel al-Jubeir, defended the Arab powers' move against Qatar as a boycott, not a blockade, adding: "We have allowed the movement of families between the two countries.so that we don't divide families".
"It's not our goal to undermine the GCC (Gulf Cooperation Council) but at the same time we don't want a member of the GCC undermining us", he said.
Saudi Arabia, Egypt, the United Arab Emirates and Bahrain accused Qatar of supporting terrorism and severed ties last week.
Turkish Foreign Minister Mevlut Cavusoglu will visit Qatar today.
Egypt has halted flights to and from Doha following its decision last week to cut diplomatic ties with Qatar, accusing the Gulf country of having links to terrorism and of interfering in the internal affairs of other countries in the region.
US President Donald Trump has signalled his support for the Saudi-led move but other US officials have been more cautious and called for dialogue to end the crisis. Oman has stayed out of the conflict.
Pakistan's Prime Minister Nawaz Sharif has expressed hopes for a swift resolution of the crisis engulfing the energy-rich nation of Qatar.
Over the weekend, Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani was in Moscow following a telephone call between Putin and Qatar's ruling emir Sheikh Tamin bin Hamad Al Thani.
Sharif's office issued a statement on Tuesday, following his return from Saudi Arabia.
King Salman Bin Abdul Aziz received the premier and his delegation upon their arrival at the Palace, and latter hosted them Iftar dinner. He denied Doha supported groups like the Muslim Brotherhood that its neighbours oppose, or had warm ties with their enemy Iran.