Mali’s ruling junta has declared an end to counterterrorism cooperation with France and expelled five French Embassy employees, according to a confidential letter seen by the Associated Press.

The note, dated September 17 and sent from Mali’s Ministry of Foreign Affairs to the French Embassy in Bamako, said the five staff members were declared personae non grata and announced the cessation of all international cooperation in the fight against terrorism. The ministry did not give a public reason for the expulsions, but a French diplomatic source told AP the move was a response to France’s own actions last week.

That back-and-forth is the latest sign of worsening relations. France had expelled two Malian intelligence officers working at Mali’s embassy in Paris and suspended counterterrorism cooperation. The AP report also says tensions rose after the arrest in August of a French intelligence officer in Bamako, where Malian authorities accused him of helping organise a coup with members of the Malian military.

The diplomatic rupture has major security implications because Mali is still struggling against armed militant groups, including factions linked to al-Qaida and the Islamic State group. The country’s security environment has remained precarious despite the departure of French troops after two military coups and the government’s turn toward Russian assistance. AP noted that attacks by extremist groups linked to al-Qaida have intensified in recent months.

The end of formal counterterror cooperation is especially significant because intelligence-sharing had continued even after the broader military partnership with France collapsed. That means the latest move may narrow one of the last remaining channels of operational contact between the two states.

The expulsion also fits a wider pattern in the Sahel. Mali, along with Burkina Faso and Niger, has increasingly distanced itself from former Western security partners since military takeovers in the region. In Mali’s case, the junta has repeatedly presented sovereignty as a central theme of its foreign policy, but the AP report makes clear that the practical effect has been a more isolated and more fragile security environment.

None of that changes the immediate facts. Mali has told France that five of its embassy staff must leave, and it has formally declared the end of counterterrorism cooperation. The French side says this came in retaliation for earlier French expulsions. The broader dispute now sits on top of a conflict that is already stretching Mali’s security forces and leaving the country exposed to militant violence.

If there is any wider lesson from the episode, it is that diplomatic retaliation in Bamako and Paris is no longer a side issue. It is part of how security policy itself is being rewritten in the Sahel.