This is stated in the message in the Telegram channel of the department.
Attached to the post is a photo of a man who looks like Medvedchuk.
The head of the SBU, Ivan Bakanov, thanked the employees for the "special operation to detain MP Medvedchuk so far."
Earlier, President of Ukraine Volodymyr Zelensky published a photo in which Viktor Medvedchuk is sitting in handcuffs.
Press Secretary of the President of Russia Dmitry Peskov said he saw this photo.
According to him, it is necessary to check the information because of the large number of fakes.