When news broke that Putin was traveling to Teheran despite death threats from terrorists, I was reminded that the last Russian leader who traveled to Teheran - Josef Stalin - also went there despite a death threat against him (and Roosevelt and Churchill, as the Big Three were traveling there in 1943 for the Teheran Conference). The plot against the Big Three was first uncovered by Soviet spy Nikolai Kuznetsov. Parachuted behind enemy lines at Rovno, Ukraine, Kuznetsov posed as Germa