Iran's President Hassan Rouhani called Monday on Saudi Arabia to end what he called the kingdom's "intrusions" in the Middle East in order to allow closer ties between the two regional rivals.

"If Saudi Arabia's vision on the big regional questions confronts reality and it stops its intrusions, we can solve many problems, especially in our relations," Rouhani told a gathering of Iranian ambassadors in Tehran.

Authorities on Monday charged a Saudi prince and nine others with drug trafficking, a week after they were caught in a record drug bust, a judicial source told AFP.

Saudi prince Abdel Mohsen Bin Walid Bin Abdulaziz and four others were detained by airport security on October 26 after nearly two tons of Captagon capsules and cocaine were found waiting to be loaded onto their private plane at Beirut's Rafik Hariri International Airport.

Saudi Arabia on Monday executed one of its citizens after he was convicted of running over and killing a fellow tribesman, the interior ministry said.

The latest execution in the western city of Taif brings to 142 the total number of death sentences carried out in the kingdom this year compared with 87 in all of 2014, according to AFP tallies.

Doctors Without Borders demanded answers Thursday from the Saudi-led coalition over the bombing of one of the medical charity's hospitals in northern Yemen, rejecting Saudi Arabia's denial of responsibility.

The hospital in the northern city of Saada was hit late Monday drawing condemnation from United Nations chief Ban Ki-moon, who also fingered the coalition forces as responsible.

Key nations backing Syria's warring sides will seek to thrash out differences at talks Thursday as Iran readies to make its debut at international negotiations on ending the four-year conflict.

Russia, the United States, Saudi Arabia and Turkey, the four major powers meeting in Vienna, support opposite sides in a war the U.S.'s top diplomat has described as "hell".

Saudi Arabia on Thursday carried out its 141st execution this year, putting one of its citizens to death for murder.

Abdulrahman al-Asmari was executed in the holy city of Mecca following his conviction for killing a fellow Saudi, the interior ministry said.

Saudi-led military operations in Yemen are nearing their end as the focus turns to political talks, Britain's foreign minister said in Riyadh on Wednesday.

"We detect the military phase of this campaign is coming to a close as the coalition forces have established a dominant military position in the country," Foreign Secretary Philip Hammond told reporters after talks with King Salman and other leading members of the royal family.

Saudi Arabia on Wednesday executed a Pakistani convicted of murdering an Indonesian couple.

The interior ministry said Amal Jan Hajji had been found guilty of killing Bambang Sukyato and his wife Suryati Widyastuti.

A Saudi prince and four others were detained on Monday in the largest drug bust in the history of the Beirut airport, a security source said.

Saudi prince Abdel Mohsen Bin Walid Bin Abdulaziz and four others were detained by security at Rafik Hariri International Airport while allegedly "attempting to smuggle about two tons of Captagon pills and some cocaine," a security source told AFP.

Saudi Ambassador to Lebanon Ali Awadh Asiri stressed that the kingdom's embassy in Lebanon is coordinating with Lebanese security agencies to “determine the seriousness” of the recent allegations of assassination threats.

He told the Saudi Okaz newspaper Sunday: “Threats against me, any member of the diplomatic mission, or Saudi expatriates are taken seriously.”