Kuwait's supreme court on Monday upheld a two-year jail sentence against prominent opposition leader Mussallam al-Barrak for insulting the emir, his group said.

"The supreme court upheld the two-year jail term against Barrak," the Popular Action Movement (PAM) said on its Twitter account, adding that the former lawmaker, who had been out on bail, will now have to serve the full sentence.

President Barack Obama tried to reassure America's Gulf allies Thursday that engaging with Iran would not come at their expense, at a Camp David summit that proved short on concrete outcomes.

Pledging to counter external threats to Gulf states amid Iran's growing role in the region, Obama said his security commitment to the decades-old allies was "ironclad."  

Kuwait has requested arbitration in a dispute with Saudi Arabia over shared oil production from the neutral zone between the Gulf neighbors which has completely halted, a newspaper reported Tuesday.

Kuwaiti daily Al-Jarida said that talks between the two governments on output from the 5,000 square kilometer (1,930 square mile) zone that they exploit jointly under a half-century-old treaty had reached deadlock.

A Shiite parliamentarian in Kuwait on Monday demanded to grill the foreign minister over the Gulf state's participation in Saudi-led air strikes against Yemen's Shiite Huthi rebels and their allies.

"Kuwait's air force has taken part in the military operations without parliament being informed," Abdulhameed Dashti said.

U.S. Secretary of State John Kerry met Gulf foreign ministers in Paris on Friday ahead of a summit in which President Barack Obama will seek to reassure the Arab monarchies over his Iran policy.

Fresh from a trip to Riyadh where he urged a ceasefire in Yemen, Kerry met foreign ministers from the six members of the Gulf Cooperation Council: Qatar, Kuwait, Bahrain, Oman, the United Arab Emirates and Saudi Arabia.

Kuwait on Friday arrested a former opposition lawmaker for alleging Iran was pressuring the oil-rich emirate to change the crown prince, the government and relatives said.

The interior ministry said Waleed al-Tabtabai had been "arrested on the orders of the public prosecution for spreading false news about the internal situation and undermining the status of the crown prince on social media."

The Gulf Cooperation Council insisted Thursday that talks on ending Yemen's conflict be brokered by the regional body and held in Riyadh rather than a neutral venue as sought by Iran.

Tehran has called for the U.N. talks between Yemen's political factions to be held somewhere other than in any of the countries taking part in a Saudi-led military campaign against Shiite rebels.

Kuwait has deported a prominent opposition figure to neighbouring Saudi Arabia months after revoking his citizenship, his group said Wednesday.

Saad al-Ajmi, former spokesman of the Popular Action Movement (PAM), was arrested by secret police on Tuesday and escorted to the Saudi city of Khafji by road at night, PAM said in a statement.

Kuwait's supreme court on Monday ordered prominent opposition leader Mussallam al-Barrak released on bail as it considers charges against him of insulting the emir, his group said.

The court ordered the ex-lawmaker to pay bail of 1,000 dinars ($3,300) and set the next hearing in his case for May 18, the Popular Action Movement said on Twitter.

Saudi Arabia has told Kuwait it wants to halt production from a jointly operated oilfield in the neutral zone between the two countries, a Kuwaiti newspaper reported on Thursday.

The Wafra field, which currently produces around 200,000 barrels per day, is the largest onshore field in the 5,000-square-kilometer neutral zone which the Gulf neighbors exploit jointly under a nearly 50-year-old treaty.