John Demjanjuk was later extradited to Germany on charges that he was another guard by the name of Ivan Demjanjuk, who served at the Sobibor extermination camp . During the trial, the problem of identity again became a key issue. Demjanjuk claimed he was not the Ivan Demjanjuk alleged to be a guard at Sobibor, and that the Trawnicki identification card supplied by the OSI to Germany, and on which the prosecution based its case, was a Soviet KGB forgery.  On 12 May 2011, Demjanjuk was convicted pending appeal by a German criminal court of being a guard at Sobibor extermination camp . Demjanjuk's appeal had not yet been heard by the German Appellate Court when he died in March 2012. As a consequence, the German Munich District Court declared him "presumed innocent." The court also confirmed that Demjanjuk's previous interim conviction was invalidated, and that Demjanuk was cleared of any criminal record. 
Ivan returned to a hero’s welcome in Moscow and the news that his wife had borne him a son and heir, though the little boy did not live long. In Kazan the Muslim population was expelled and Russian colonists were moved in, mosques were replaced by Russian Orthodox churches and the Tartars of the surrounding country were pressed to convert to Christianity. Four years later, in 1556, Ivan annexed the Khanate of Astrakhan, further south-east, which made the whole Volga a Russian river and gave Muscovy complete control of the important trade-route to the Caspian Sea.