Has the united nations ever had to intervene in any conflict involving kingdom?

Yes, the United Nations has intervened in several conflicts involving the Kingdom of Saudi Arabia.

* Yemeni Civil War (2015-present): The Saudi-led coalition intervened in the Yemeni Civil War in 2015, with the stated goal of restoring the internationally recognized government of President Abdrabbuh Mansur Hadi. The coalition has been accused of committing war crimes and human rights abuses in the conflict. The UN has called for a cessation of hostilities and a resumption of peace talks.

* Lebanese Civil War (1975-1990): Saudi Arabia intervened in the Lebanese Civil War several times throughout the conflict, sending troops and aid to various factions. The Saudi intervention was primarily motivated by a desire to counter Iranian influence in Lebanon.

* Libyan Civil War (2011): Saudi Arabia was part of a multinational coalition that intervened in the Libyan Civil War in 2011, with the stated goal of protecting civilians and supporting the rebels attempting to overthrow Muammar Gaddafi. Saudi Arabia provided air support, military vehicles, and ammunition to the rebels.