Polish police arrest a man suspected of involvement in the killing of a Russian artist in Poland. The victim is described by officials as a vocal critic of President Vladimir Putin. Prime Minister Donald Tusk says the arrest is connected to the murder and refers to the suspect’s alleged participation in the attack. The reporting indicates that investigators are treating the case as a targeted killing and are seeking to determine the suspect’s role and whether others are involved. Authorities do not present further details in the available accounts, including the suspect’s identity, the timeline of the killing, or the circumstances surrounding the death. Police continue to investigate, and the arrest is part of an ongoing effort to establish responsibility for the murder. The case has attracted attention in light of the victim’s public criticism of Putin and the broader political context involving Russian dissent figures abroad.