Andrei Falkov appears to have taken part in the 2020 protests in Minsk.
This is indirectly evidenced by comments from other people under his photos on social networks. In fact, the last time the man logged into social networks was in July last year. Most likely, it was at this time that he was detained.
The photographs on Andrey Falkov's pages show that the man traveled a lot and was actively involved in sports.

