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Saudi Arabia's named his son and heir as the kingdom's prime minister and his second son Prince Khalid as defence minister, a royal decree said on Tuesday.

The reshuffle kept another son, Prince Abdulaziz bin Salman, as energy minister, the royal decree, carried by state news agency SPA, said.

Foreign Minister , Finance Minister Mohammed al-Jadaan and Investment Minister Khalid al-Falih remained unchanged, the decree showed.

The crown prince, known as MbS, had been the defence minister and has been the de facto ruler of , the world's top oil exporter and a major US ally in the Middle East.

Prince Khalid bin Salman, MbS's younger brother, previously served as deputy defence minister.

will still preside the cabinet meetings that he attends, the decree said.

The 86-year-old king, the custodian of Islam's holiest sites, became ruler in 2015 after spending more than 2-1/2 years as the crown prince. He has been hospitalised several times over the last two years.

Prince Mohammed has changed Saudi Arabia since he rose to power in 2017 as he led efforts to diversify the economy from , allowed women to drive and curbed the clerics' power over society.

His reforms, however, have come with a massive crackdown on dissent, with , royals, women rights' activists and businessmen jailed.

The killing of Saudi journalist in the kingdom's consulate in Istanbul in 2018 has tarnished his reputation and strained the kingdom's relations with the United States and other Western allies.

(Reuters)