NATO Sergeant Loses Security Clearance After Marrying a Russian Citizen.

The Case of Sergeant A. O. N.

According to Espreso.tv: A Spanish Armada sergeant, identified as A. O. N., had his access to classified NATO intelligence revoked after marrying a Russian national and obtaining Russian citizenship—without notifying Spanish intelligence authorities. The Spanish National Intelligence Centre (CNI) withdrew his personal security clearance in February 2023. A court later upheld the decision, citing legitimate security concerns and noting the sergeant's 'pro-Russian sympathies.'

Details Behind the Revocation

Sergeant A. O. N. served as an electronic warfare specialist aboard the submarine S-70 'Galerna.' He acquired Russian citizenship in 2014 and married a Russian woman on December 27, 2023, though the marriage was officially registered in Spain in April 2025. Given these circumstances, the CNI determined that continued access to sensitive information posed an unacceptable risk.

The sergeant is challenging the CNI's decision and preparing an appeal to Spain's Supreme Court. The case has stirred public debate, as it touches on national security and military service. Its outcome could carry significant consequences for both the sergeant and the Spanish armed forces.

This situation underscores the critical importance of security and trust within the military, especially amid rising geopolitical tensions. Losing access to classified material due to ties with a country viewed as a potential threat has raised alarm among military and intelligence agencies. How this case is resolved may shape Spain's future policies on security clearances and personnel management in the armed forces.