Iran said Monday it was "deeply concerned" by escalating attacks between Yemen's Tehran-backed Houthis and Saudi Arabia, after 14 people died in strikes on Riyadh's airport over the weekend.

"We are deeply concerned about the developments taking place in the Arabian Peninsula," foreign ministry spokesman Esmaeil Baqaei told a weekly press conference, adding that Tehran was ready "to use our good offices to help facilitate dialogue between the parties".

A projectile struck a passenger terminal at the international airport in Riyadh on Sunday, a day after a missile hit the same terminal and killed 12 people, the Saudi-led coalition fighting Iran-backed Houthi rebels in Yemen said. The Houthis claimed responsibility for those attacks and others.

Saudi authorities said one person, described as a Pakistani national, was killed, and 11 were injured in the latest attack on the domestic terminal complex at King Khalid International Airport.

Russian President Vladimir Putin has told Donald Trump about Iran's position on a possible Mideast peace deal, the Kremlin said.

The deadliest strike on Saudi soil in more than a decade killed 12 people at Riyadh's international airport and wounded hundreds, prompting the Saudi-led coalition to vow on Sunday a decisive response against Yemen's Houthis.

Peace negotiations with Iran would only succeed without "pressure and threats", Iranian President Masoud Pezeshkian said Friday, amid deadlocked efforts to end months of fighting in the Middle East.

Iraq has rejected Syria's request to repatriate thousands of suspected Islamic State members transferred from Syrian detention centers to Iraqi custody earlier this year, a senior Iraqi security official said.

Iraqi National Security Advisor Qasim al-Aboudi said Wednesday that a meeting had been held recently between Syria, Iraq and the United States to discuss the fate of the prisoners.

Pakistan has a "substantial" number of forces deployed in Saudi Arabia acting in a defensive capacity, Pakistan's foreign ministry spokesman said on Friday.

"From Pakistan already we have substantial number of forces as well as resources in town, in Riyadh," foreign ministry spokesman Sajjad Haider Khan told journalists, adding Pakistani military personnel in the kingdom "would not be crossing the borders of the other side for an attack on the Houthis, but of course (is acting) in the defense of the territory".

Iranian President Masoud Pezeshkian said Friday at a regional summit in Turkmenistan that peace negotiations will only succeed without "pressure and threats", with the months-long Middle East war locked in a stalemate.

"Dialogue holds meaning and a chance of success only when based on mutual respect and mutual commitments, and when devoid of pressure and threat," he said during his speech at the Commonwealth of Independent States (CIS) summit.

Saudi Arabia will not agree to a truce or a ceasefire with the Houthis until the Yemeni government that it backs regains all the territory it has lost in recent weeks, a regional source told AFP on Friday.

Saudi Arabia will also not bow to the Houthis' "military blackmail", the source added, speaking on condition of anonymity due to the sensitivity of the matter.

An airline pilot was among three Saudi citizens killed in attacks targeting Riyadh's King Khalid International Airport and a Saudia aircraft, the kingdom's civil aviation authority said on Friday. Several people "of different nationalities" were wounded.

The attacks on Thursday were the deadliest in Saudi Arabia since the kingdom and allied forces in neighboring Yemen launched a major military offensive against Yemen's Iran-backed Houthi rebels last weekend.