On March 29, 1986, an Italian court acquitted Antonov, and the assassin, Ali Agca, remained in prison for life. On April 1, 1986, after 1,222 days behind bars in an Italian prison, Antonov returned to Sofia in a severe physical and mental condition, diagnosed with cerebral atrophy caused by psychotropic drugs which, according to doctors, were forcibly administered to him in prison.

In May 2002, during his official visit to Bulgaria at a meeting with President Georgi Parvanov, Pope John Paul II stated: "I never believed in the so-called Bulgarian trace in the assassination attempt against me, it was an insinuation and a great injustice to the Bulgarian people.”. 

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