Moscow: Russia has detained a Chinese national for trying to gain secret information about the S-300 air defence system, officials said Wednesday.
Tun Shenjun was arrested Oct 28 last year but the news of his arrest has only just been made public.
Tun was working as a translator for official delegations and was gathering secret information from Russian citizens about the missile system, the Federal Security Service (FSB) said.
Russia has supplied the S300 system to China, and Beijing is also licensed to manufacture it. The S300 has been replaced in Russia with the S400.