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The US government has imposed sanctions on a network of four individuals and four companies alleged of hiring Colombian mercenaries to fight for and train a Sudanese paramilitary group that Washington accuses of genocidal acts.

Network Composition

Disclosing the measures on this week, the Treasury stated the scheme was largely composed of Colombian citizens and firms.

Scores of former Colombian military personnel have been recruited to go to the Sudanese warzone to combat beside the Rapid Support Forces (RSF), a faction accused of severe violations including targeted ethnic killings and mass abductions.

Discovery of Participation

The role of these mercenaries was first uncovered last year, after an inquiry which found that more than 300 retired troops had been recruited to participate in the war – an discovery that led to an unusual statement of regret from Colombia’s foreign ministry.

Colombian ex-soldiers have long been considered as among the world’s most sought-after mercenaries due to their considerable warzone knowledge acquired during a long-running domestic war, knowledge of Western military gear, and superior tactical education.

Reported Actions

In the Sudanese theater, the mercenaries have allegedly instructed child soldiers, taught fighters to pilot drones, and fought directly on the frontlines. One source remarked that instructing minors was "awful and crazy" but noted that "sadly, that is the nature of conflict".

Targeted Persons

Among those sanctioned was a retired Colombian officer, a dual Colombian-Italian national and retired Colombian military officer operating from the United Arab Emirates. The US authorities accused him a key part in enlisting and transporting mercenaries to Sudan. His wife, Claudia Viviana Oliveros Forero, was also sanctioned.

Also on the restricted list was Mateo Andrés Duque Botero, a dual national who officials alleged oversaw a company linked to handling funds and payroll for the recruitment operation. "Over the past two years, US-based firms connected to Duque carried out numerous wire transfers, worth millions," the government release stated.

Citizen of Colombia Mónica Muñoz was the final person to be sanctioned, with the company she managed alleged to have money transfers associated with Duque and his businesses.

"The US once more urges foreign parties to cease providing financial and military support to the belligerents," the department said in a statement.

Expert Analysis

An expert, with the International Crisis Group, described the measures as a "very significant" development, saying that "calling out those who are doing the contracting is the correct approach".

It was also noted that, Bogotá has enacted a piece of legislation ratifying the International Convention Against the Recruitment and Use of Mercenaries, aiming to curb its citizens' long history in foreign conflicts and reshape national security policy.

Sean McFate, an expert on mercenaries, called for greater wariness, noting that "restrictions are needed but not enough for addressing widespread use of contractors".

"It’s an illicit economy and centered in Dubai, which is relatively sanction-proof," he said. The UAE has been repeatedly implicated of supplying weapons to the paramilitary group, allegations it disputes. "More contractors from Colombia are likely," the expert cautioned.