The suspect, identified only as Sergei K. under German privacy laws, is believed to have been in contact with Russia's intelligence service from Germany since at least May last year, the Reuters news agency reported, citing German prosecutors.
They said in a statement that the man provided details on German military assistance to Ukraine and information about the country's arms and defence industry, particularly companies involved in developing drones and robotic systems.
The suspect, who was detained in Berlin on Tuesday, is also accused of sending photographs of public buildings in the German capital and of military convoys on highways, including a convoy from a NATO member state, Reuters reported.
Prosecutors said they believe he also passed on information about potential targets for sabotage in Germany and offered to recruit people for a sabotage and espionage unit.
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Source: Reuters, dpa, polskieradio24.pl