Khodorkovsky, living in exile, is a well-known opponent of the Russian regime and President Vladimir Putin.
Former Russian oligarch Mikhail Khodorkovsky will arrive in Finland on Sunday.
Khodorkovski will take part in the demonstration against the Russian war of aggression, which will be held at Helsinki’s Kansalaistor at 2 p.m.-4 p.m.
The demonstration is organized by the Russia for Democracy movement founded by Russian-speakers in Finland.
Khodorkovsky is one of the most famous Russian president Vladimir Putin of opponents.
Khodorkovsky, who was one of the richest in Russia, was arrested in 2003 on suspicion of financial crimes after he had financed the opposition movement.
Putin pardoned him in 2013, after which he has lived in exile.