That means China has choices.

The official, Saad al-Jabri, was told to leave his mobile phone on a table outside. MBS did the same. The two men were now alone. The young prince was so fearful of palace spies that he pulled the socket out of the wall, disconnecting the only landline telephone.According to Jabri, MBS then talked about how he would wake his kingdom up from its deep slumber, allowing it to take its rightful place on the global stage. By selling a stake in the state oil producer Aramco, the world’s most profitable company, he would begin to wean his economy off its dependency on oil. He would invest billions in Silicon Valley tech startups including the taxi firm, Uber. Then, by giving Saudi women the freedom to join the workforce, he would create six million new jobs.

Astonished, Jabri asked the prince about the extent of his ambition. “Have you heard of Alexander the Great?” came the simple reply.MBS ended the conversation there. A midnight meeting that was scheduled to last half-an-hour had gone on for three. Jabri left the room to find several missed calls on his mobile from government colleagues worried about his long disappearance.The story of the extraordinary rise to power of the man who runs Saudi Arabia and whose control of oil affects everyone, starting with how he outwitted hundreds of rivals to become crown prince.

For the past year, our documentary team has been talking to both Saudi friends and opponents of MBS, as well as senior Western spies and diplomats. The Saudi government was given the opportunity to respond to the claims made in the BBC’s films and in this article. They chose not to do so.Saad al-Jabri was so high up in the Saudi security apparatus that he was friends with the heads of the CIA and MI6. While the Saudi government has called Jabri a discredited former official, he’s also

to have dared speak about how the crown prince rules Saudi Arabia – and the rare interview he has given us is astonishing in its detail.

By gaining access to many who know the prince personally, we shed new light on the events that have made MBS notorious – includingJabri goes much further, accusing MBS of forging his father the king’s signature on a royal decree committing ground troops.

Jabri says he discussed the Yemen war in the White House before it started; and that Susan Rice, President Obama’s National Security Advisor, warned him that the US would only support an air campaign.However, Jabri claims MBS was so determined to press ahead in Yemen that he ignored the Americans.

“We were surprised that there was a royal decree to allow the ground interventions,” Jabri says. “He forged the signature of his dad for that royal decree. The king’s mental capacity was deteriorating.”Jabri says his source for this allegation was “credible, reliable” and linked to the Ministry of Interior where he was chief of staff.