Serbian intelligence agencies have uncovered a wide-ranging intelligence operation involving Russian spies and members of the Serbian military, President Aleksandar Vucic said on Thursday.

Vucic’s remarks came after a meeting of the National Security Council which he convened after a video showing a Russian intelligence officer handing money to a Serbian man in Belgrade was made public on YouTube over the weekend.

The video, which was not made by Serbian agents, showed a man identified as Lt. Col. Georgy Kleban, a former assistant military attache at Russia’s embassy in Belgrade, meeting a Serbian retired army officer, whom Vucic identified only as Z.K.

Vucic said the meeting took place last December. He did not say who had made the video.

Read more: the moscow times