Flowers and a condolence message that reads “In memory of Boris” are placed with a portrait of Boris Nemtsov, a charismatic Russian opposition leader and sharp critic of President Vladimir Putin, at the site where Nemtsov was gunned down near the Kremlin, against a backdrop of the Kremlin Wall, in Moscow, Russia, Monday, March 2, 2015. Nemtsov was killed on Friday, Feb. 27 in what many in the opposition believe was reprisal for his unrelenting criticism of Putin. No suspects have yet been detained in connection with the killing. (AP Photo/Ivan Sekretarev)