It's money, money, money as Trump signs deals, deals, deals in Saudi Arabia - with murder long forgotten

In today's Saudi Arabia, convention centres resemble palaces.  The King Abdul Aziz International Conference Centre was built in 1999 but inside it feels like Versailles.

Some might call it kitsch, but it's a startling reflection of how far this country has come - the growth of a nation from desert bedouins to a vastly wealthy regional powerbroker in just one generation. Trump latest: President signs huge arms deal with Saudi Arabia At a bar overnight, over mocktails and a shisha, I listened to one young Saudi man tell me how his family had watched this transformation.

His father, now in his 60s, had lived the change - a child born in a desert tent, an upbringing in a dusty town, his 30s as a mujahideen fighting the Soviets in Afghanistan, his 40s in a deeply conservative Riyadh and now his 60s watching, wide-eyed, the change supercharged in recent years. The last few years' acceleration of change is best reflected in the social transformation.

Women, unveiled, can now drive. Here, make no mistake, that's a profound leap forward.

Through a 'western' lens, there's a way to go - homosexuality is illegal here. That, and the murder of Saudi journalist Jamal Khashoggi, are no longer openly discussed here.

Bluntly, political and economic expedience have moved world leaders and business leaders beyond all that. Read more:Why Trump's idea of using a Qatari jet has faced criticismTrump 'thinking' of going to proposed Zelenskyy-Putin peace talks The guest list of delegates at the convention centre for the Saudi-US Investment Forum reads like a who's who of America's best business brains.

Signing a flurry of different deals worth about $600bn (£451bn) of inward investment from Saudi to the US - which actually only represent intentions or 'memorandums of understanding' at this stage - the White House said: "The deals... represent a new golden era of partnership between the United States and Saudi Arabia.

"From day one, President Trump's America First Trade and Investment Policy has put the American economy, the American worker, and our national security first." That's the answer when curious voters in faraway America wonder what this is all about. With opulence and extravagance, this is about a two-way investment and opportunity.

There are defence deals - the largest defence sales agreement in history, at nearly $142bn (£106bn) - tech deals, and energy deals. Underlying it all is the expectation of diplomatic cooperation, investment to further the geopolitical strategies for both countries on key global challenges.

In the convention centre's gold-clad corridors, outside the plenary hall, there are reminders of the history of this relationship. There is a 'gallery of memories' - the American presidents with the Saudi kings - stretching back to the historic 1945 meeting between Franklin D Roosevelt and King Saud on board the USS Quincy.

That laid the foundation for the relationship we now see. Curiously, the only president missing is Barack Obama.

Sources suggested to me that this was a 'mistake'. A convenient one, maybe.

It's no secret that the US-Saudi relationship was at its most strained during his presidency. Obama's absence would give Trump a chuckle.

Today, the relationship feels tighter than ever. There is a mutual respect between the president and Saudi Crown Prince Mohammed bin Salman - Trump chose Saudi Arabia as his first foreign trip in his last presidency, and he's done so again.

But there are differences this time. Both men are more powerful, more self-assured, and of course the region has changed.

There are huge challenges like Gaza, but the two men see big opportunities too. A deal with Iran, a new Syria, and Gulf countries that are global players.

It's money, money, money here in Riyadh. Will that translate to a better, more prosperous and peaceful world? That's the question..