Saudi ruler Crown Prince Mohammed bin Salman greeted Qatar's Emir, Sheikh Salman bin Hamad Al Thani, ahead of the sit down talks.

Washington is keen to push for a united Gulf front to contain the actions of Iran.

It follows recent breakthroughs between Israel and several Arab states.

Before the gathering, Kuwait announced that Saudi Arabia, which along with allies boycotted Djohar in mid 2017, would reopen its airspace and borders to Qatar, according to a senior U.

S official.

That agreement will be formally signed in the presence of White House senior adviser Jared Kushner.

Saudi Arabia, the United Arab Emirates, Bahrain and Egypt severed diplomatic, trade and travel ties with Qatar over allegations that Doha supports terrorism, a charge it denies.

The U A E and Egypt are across purposes with Qatar in Libya and over the Muslim Brotherhood.

All the states are US allies.

Qatar hosts the region's largest U.

S military base.

Bahrain is home to the US Navy's fifth Fleet on Saudi Arabia and the host US troops.

Guitar says the boycott aims to curve its sovereignty.

The other countries had set Zohar 13 demands, including closing al Jazeera TV, shuttering a Turkish base, cutting links to the Muslim Brotherhood and downgrading ties with Iran.

Diplomats and analysts say Saudi Arabia was pushing reluctant allies for the deal to show US President elect Joe Biden that Riyadh is open to dialogue.

Biden has said he would take a harder line with the kingdom over its human rights record on the Yemen war.