The Iran-backed Houthis reportedly advanced to Yemen’s strategic Perim Island on Friday, delivering a major boost to the militant group’s push to take control of one of the world’s most important shipping choke points.

The capture of Perim Island, which was reported by several news agencies, citing multiple Yemeni government sources, comes just one day after the Houthis seized Yemen’s port city of Mokha on the Red Sea coast. CNBC could not independently confirm the report.

The rapid ground offensive is seen as a severe setback to Saudi Arabia and the Yemeni forces it backs and puts Iran and its proxies on course to exercise control over two critically important oil choke points on either side of the Arabian Peninsula: the Bab el-Mandeb Strait and the Strait of Hormuz.

Perim Island is a small and rocky area of land that divides the Bab el-Mandeb Strait, a waterway that connects the Red Sea to the Gulf of Aden and to global markets.

There are concerns that the Houthis’ advance toward the Bab el-Mandeb Strait could have significant ramifications for global trade, particularly if the militant group ratchets up threats or attacks on Red Sea shipping.

The Houthi advance prompted Saudi Crown Prince Mohammed bin Salman to personally press President Donald Trump for U.S. military intervention, MS NOW reported later Friday, according to a person familiar with the conversations.

The crown prince spoke with Trump twice Thursday and urged him to strike the Iranian-backed group as it closed in on the Bab el-Mandeb. Trump declined, saying the U.S. does not plan to widen its regional military campaign to include the Houthis, according to the person, who was granted anonymity because of the sensitive nature of the conversations. Axios first reported the calls.

A senior administration official told CNBC the U.S. remains focused on protecting core national security interests, including freedom of navigation in the Red Sea, “while empowering our regional partners to take the lead in managing and resolving regional security challenges.”

The official added that the U.S. is “in continuous dialogue with Saudi Arabia.”

The capture of Mokha marked a “major blow” to Saudi Arabia as it raises the possibility of the group exerting a tighter grip on the Bab el-Mandeb Strait, according to Hamish Kinnear, principal Middle East and North Africa analyst at risk intelligence company Verisk Maplecroft.

Mokha is situated about 75 kilometers (46 miles) north of the Bab el-Mandeb Strait.

“The Houthis were already threatening Saudi shipping from previous positions, but their capture of Mocha opens up the possibility of further advances towards the Bab el-Mandeb coastline and a tighter grip on the chokepoint,” Kinnear said in a research note.

As the war continues, Kinnear said both Tehran and Washington believe time is on their side, making a new truce unlikely for now.

“Oil and gas prices, and more specifically refined products such as diesel, will continue to tick upwards while that remains the case – even if US convoys and Strait of Hormuz export alternatives cushion the price impact,” Kinnear said.

The strategic importance of the Bab el-Mandeb Strait has grown significantly since the start of the U.S. and Israel’s war against Iran in late February, with the waterway emerging as an alternative route for crude moving toward Asia.

What next for oil prices?

Oil prices traded sharply lower on Friday, but both major benchmarks could still end the week above $100 per barrel for the first time since mid-May.

International benchmark Brent crude

The resilience of the oil market is being tested by a clearer recognition of the mounting threat to regional supply, strategists at ING said, with energy market participants seen repricing both the duration and severity of the conflict.

Even as flows continue through the Strait of Hormuz, ING’s strategists said flows remain well below prewar levels, underlining how fragile the situation has become.

“Saudi energy infrastructure and crude oil exports from the Red Sea are increasingly at risk, with the Houthis in Yemen targeting Saudi Arabia,” ING’s Warren Patterson and Ewa Manthey said in a research note published Friday.

“As the Houthis have taken control of the Red Sea port of Mokha in Yemen, recent events increase the threat to shipping around the Bab al-Mandeb Strait,” they added.

— Luke Fountain contributed to this report.

A range of equity market bubble indicators show that while the S & P 500 ‘s rally has further to run this year, its medium-term prospects look poor given how frothy the market has become, according to Capital Economics. “Most indicators suggest the AI equity boom is nearing an end,” Capital Economics’ senior market economist James Reilly said Thursday in a note. Capital has been more bullish than most on the stock market since mid-2023, reflecting a view that AI will be a transformative technology. Its year end-2026 S & P 500 forecast has consistently been above consensus. But the firm has also maintained that the AI-driven rally is a bubble that will eventually burst. To assess and spot a late-stage market bubble, Reilly looks at eight indicators including valuations, earnings, index concentration, equity issuance and foreign interest in U.S. equities. Some of those measures are already at or near levels that preceded previous stock market peaks. The analysis shows that while market variables such as earnings expectations look consistent with a market top, others such as volatility and leverage look slightly less alarming. Earnings stand out as the biggest warning sign. Expectations for S & P 500 earnings growth are around levels seen only at the peak of the dot-com bubble, while long-term EPS growth forecasts have surged to a record high. According to Reilly, the heavy concentration of this expected growth in the tech sector means that any signs of weakness in the tech firms’ earnings will weigh heavily on the index. Other indicators are also flashing warning signs. Index concentration is around dot-com-era extremes, net equity issuance has turned positive and foreign ownership of U.S. stocks is at a record high. Reilly said another wave of IPOs and share sales could be particularly significant, since similar issuance booms have historically coincided with market peaks. “On past form, this suggests that the end of the bubble is just months away, rather than years,” he said. Measures of leverage are not yet alarming compared to other factors, though the analyst warns that they are heading in a “concerning direction.” While volatility metrics look consistent with a mid -stage bubble, Reilly notes that constituent -level volatility isn’t as extreme as it was near the end of the dotcom boom. “While we continue to think that the S & P 500 will rally from around 7,650 now to 8,250 by end-2026 , we ultimately forecast it to fall back to 6,500 by end -2027,” he wrote. Those assumptions would equate to 8% upside this year and a 21% slide in 2027.

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The British pound has largely shrugged off another change of government and geopolitical shocks to outperform many of its peers this year, but the currency’s recent weakness could be set to deepen.

Sterling has gained around 1.6% against the euro

It is near-flat against the U.S. dollar

The resignation of Prime Minister Keir Starmer on July 20 left Britain facing its seventh leader in 10 years, with markets watching closely whether a new administration would hold to the “fiscal rules” repeatedly emphasized by former Finance Minister Rachel Reeves.

U.K. borrowing costs have risen under Starmer’s quickly appointed successor Andy Burnham, also of the center-left Labour Party, but that has occurred in lockstep with a global government bond sell-off.

Matthew Ryan, head of market strategy at financial services firm Ebury, said that a “clean and orderly transition of power” had “removed a potential banana skin and eased the perceived political risk premium attached to the pound.”

Britain’s long-term borrowing costs are the highest since 1998

In a Friday note, Ryan said sterling had been “the surprise outperformer” among the G10 group of wealthy nations over the past three months, tying this to an unexpectedly resilient U.K. economy.

Gross domestic product grew by 0.4% in the second quarter, following 0.6% expansion in the first quarter — one of the strongest performances among advanced economies. Sunny weather and excitement around the FIFA World Cup boosted consumer spending, while business activity remained surprisingly resilient despite the volatile geopolitical backdrop.

The pound also drew support at the start of the Iran conflict in April on outsized market expectations for a monetary policy response to inflation fears from the Bank of England, Jane Foley, senior FX strategist at Rabobank, told CNBC.

The U.K. is highly vulnerable to higher oil and gas costs, both of which have spiked this year, helping push headline inflation near 3%.

Sterling weakness ahead?

Despite the resurgence of price pressures, the Bank of England has held its key interest rate at 3.75% throughout this year.

Current market pricing suggests low odds of a rate hike at its September meeting. In contrast, there are high expectations for a hike by the European Central Bank on Wednesday and, increasingly, the Federal Reserve later this month.

Central bank rate hikes typically boost their home currency.

Dovish messaging by the BOE on Sept. 17 would “further expose the pound” just before markets get anxious for the first annual budget announcement of Burnham’s administration on Oct. 28, Foley of Rabobank noted.

New U.K. Finance Minister John Healey said in a Monday speech that he would remain committed to fiscal discipline, while targeting a more even distribution of economic growth around the country — in contrast to the concentration of growth in powerhouse London.

JP Morgan U.K. economist Allan Monks said his remarks suggested a cautious approach to tax and spending changes given the backdrop of higher borrowing costs. The budget is likely to retain a focus on devolution, greater public control of public services and more private sector partnerships, but contain little to change the macro outlook, Monks said in a note Monday.

Ebury’s Matthew Ryan said the budget contained a high level of political risk, and was likely to contain “a combination of higher ancillary tax rates and an increase in debt issuance in order to fund Burnham’s spending ambitions.”

These could include changes to taxes on property purchases and local council duties, an introduction of a “mansion tax” and tighter pension and personal investment account relief, he said, adding that markets would be jumpy over anything that looked likely to dampen growth and squeeze the private sector, while simultaneously requiring more borrowing.