History of opposition to Vladimir Putin seen as most likely reason for death of former deputy prime ministerMoscow police are on the hunt for the killers of Boris Nemtsov, the Russian opposition politician who was gunned down in the shadow of the Kremlin’s towers late on Friday night, but his friends and political partners say they fear the real killers will never be brought to justice.Many of those close to Nemtsov believe the 55-year-old former deputy prime minister was killed either for his opposition to the Kremlin, or by shady nationalist forces reacting to a long propaganda campaign on state-controlled television calling the political opposition traitors.