The German national, whom the prosecutor’s office identified only as Thomas H, repeatedly approached Russia’s consulate in Bonn and embassy in Berlin from May on his own initiative and offered his cooperation, the office said.

“The Federal Prosecutor has arrested a German officer on suspicion of working for a foreign secret service,” wrote justice minister Marco Buschmann on social media platform X. “Vigilance is the order of the day.”

Germany, one of the largest providers of military hardware to Ukraine, is a major target of Russian spying operations, which have grown in scale since Russia’s 2022 invasion of Ukraine, authorities have warned.

On one occasion, the man handed over the information obtained during the course of his work with the intention that it be passed on to a Russian intelligence service, the federal prosecutor’s office said.

He was arrested in Koblenz, the procurement agency’s seat in western Germany, and his home and workplace were searched, it added. A judge remanded him in custody yesterday.

The prosecutor’s office gave no further details. Germany’s defence ministry declined to comment on the case.

Almost 12,000 people work for the procurement agency, among them some 1,800 soldiers. In 2021, the agency struck deals to purchase Bundeswehr weapons and equipment with a total volume of €17.6 billion.

In December, authorities arrested a German foreign intelligence service (BND) employee suspected of spying for Russia.