June 18 (UPI) -- Police in Poland arrested a suspect in the murder of Russian artist Robert Kuzovkov, 44, publicly known as Semyon Skrepetsky, who was shot and killed Monday. Polish Prime Minister Donald Tusk announced the arrest of a 36-year-old man with a Georgian passport. They haven't released the man's name. Kuzovkov died in Biała Podlaska, which is about 25 miles from the border with Belarus. He had been a vocal critic of Russian President Vladimir Putin, the late Soviet leader Joseph