WASHINGTON — Secretary of State Mike Pompeo will designate the Houthi rebels in Yemen as a overseas terrorist group, 4 U.S. officers accustomed to the choice mentioned on Sunday, deploying one among his final technique of exhausting energy in opposition to Saudi Arabia’s nemesis on the risk of exacerbating a famine in one of many world’s poorest nations.

It isn’t clear how the terrorist designation will inhibit the Houthi rebels, who’ve been at warfare with the Saudi-backed authorities in Yemen for almost six years however, some analysts say, pose no direct risk to america.

Mr. Pompeo will announce the designation in his final full week as secretary of state, and greater than a month after assembly with Crown Prince Mohammed bin Salman of Saudi Arabia, who started a navy intervention with Arab allies in opposition to the Houthis in 2015. That marketing campaign has killed civilians, destroyed infrastructure and aggravated a humanitarian disaster that has led to millions of hungry Yemenis.

Spokespeople for the State Division didn’t reply to requests for remark Sunday night time, and the U.S. officers who confirmed the designation spoke on the situation of anonymity because it had not but been introduced. The approaching announcement was reported earlier Sunday night by Reuters.

The Houthis’ inclusion on the department’s list of foreign terrorist organizations implies that fighters inside the comparatively decentralized motion can be reduce off from monetary assist and different materials assets which are routed via U.S. banks or different American establishments.

However the Houthis’ essential patron is Iran, which continues to ship assist regardless of being hobbled by severe U.S. economic sanctions, rendering the impact of the designation on the rebels extra symbolic than searing.

For the remainder of Yemen, nonetheless, the designation will all however actually worsen the devastation.

Consultants mentioned it would chill humanitarian efforts to donate meals and drugs to Houthi-controlled areas in northern and western Yemen, the place a majority of the country’s 30 million people live, for concern the help can be seized by the rebels and used for revenue that might be traced again to help organizations. The rebels additionally management the capital, Sana, and components of the strategic port city of Hudaydah, the place a lot of the humanitarian help from internationally is unloaded.

The United Nations estimates that about 80 p.c of Yemenis rely upon meals help, and almost half of all youngsters undergo stunted development due to malnutrition. On Nov. 20, the U.N. secretary basic, António Guterres, mentioned Yemen was “now in imminent hazard of the worst famine the world has seen for many years.”

“I urge all these with affect to behave urgently on these points to stave off disaster, and I additionally request that everybody avoids taking any motion that would make the already dire scenario even worse,” Mr. Guterres mentioned then. “Failing that, we danger a tragedy not simply within the quick lack of life however with penalties that may reverberate indefinitely into the long run.”

Some Houthi leaders had already been singled out for terrorist-related American sanctions. The broader designation in opposition to all the motion has been under consideration by the Trump administration for years.

That Mr. Pompeo is issuing it now, within the administration’s closing days, is an indication of his willpower to keep up his signature pressure campaign in opposition to Iran for so long as attainable.

The USA accuses the Houthi rebels of being proxy fighters for Iran, seeking to destabilize neighboring Saudi Arabia by lobbing missiles over its border and striking its oil fields. However a big assault on two state-owned Saudi Aramco oil services in September 2019, which the Houthis mentioned they carried out, gave the impression to be much more refined than the rebels’ earlier strikes.

That suggested that Iran was directly involved, because the Trump administration has asserted, regardless of Tehran’s denials.

“The Trump administration may have leveraged its ties to Saudi Arabia for the previous 4 years to get nearer to a decision on the battle,” Ariane Tabatabai, a Center East fellow on the German Marshall Fund, a public coverage assume tank, mentioned in a latest interview in anticipation of the designation. “As an alternative, the administration selected to chop clean checks to Saudi leaders.”

She predicted the terrorist designation was a part of a method to drive the administration of President-elect Joseph R. Biden Jr. to keep up the powerful line on Iran — or danger the political penalties of getting “to clarify to home critics and regional companions why it’s reversing sanctions.”

The Trump administration has steadfastly backed Saudi Arabia and its allies within the warfare in Yemen, offering intelligence and billions of {dollars} in weapons over the objections of Congress, regardless of indiscriminate bombings that have killed civilians and different navy atrocities that would amount to war crimes.

In October, the rebels released two American hostages and the remains of a third in a prisoner swap that additionally allowed about 240 Houthis to return to Yemen from Oman. The freed Houthis included fighters captured by the Saudi-led coalition and officers who had gone to Oman for worldwide peace talks and weren’t allowed to go dwelling.

Past the looming famine, the terrorist designation may additionally seal the destiny of an immense rusting oil tanker moored off Yemen’s western coast.

In comparison with a floating bomb, partly due to the flamable buildups of fuel it might be carrying in its tanks, the decaying vessel, the FSO Safer, isn’t removed from the Hudaydah port. If it both explodes or just falls aside, it may dump greater than 1.1 million barrels of oil into the Crimson Sea, destroying its ecosystem in a spill 4 occasions higher than that of the Exxon Valdez catastrophe in 1989.

A couple of half-dozen Houthis are aboard the vessel, together with a small crew of state-backed engineers from the state-owned firm that holds the title to it, mentioned Ian M. Ralby, the chief govt of I.R. Consilium, a maritime safety consultancy. The terrorist designation may stop U.N. negotiators from working with the Houthis as rapidly as attainable to restore the vessel or in any other case defuse the hazard it poses.

“If we don’t wish to trigger Yemen to lose a whole era,” Mr. Ralby mentioned, “we have to again off this designation.”

Edward Wong contributed reporting.