In 1991 he was transferred to the Defence Ministry, upon explicit request by Gojko Šušak,[1] himself a former émigré who had returned from Canada and who was at the time Minister of Emigration in the Cabinet of Franjo Gregurić.

[1] In 2005, the Federal Criminal Police of Germany issued a warrant for Perković's arrest, over his alleged implication in the 1983 assassination of émigré Stjepan Đureković in Wolfratshausen, Bavaria.

[5] This amendment was highly controversial in Croatia; the government's critics dubbed the law Lex Perković, asserting it was changed specifically to protect him.

[5] Chairman of the Committee for European Issues of the German Bundestag, Gunther Krichbaum, expressed discontent, stating this was a political move by the Croatian government with the intent of making an ad hoc law exclusively protecting Perković from extradition.

[2] Another former intelligence chief, Zdravko Mustač, was also extradited to Germany over alleged involvement in the Đureković murder, and the trial for both of them started at a Munich court on 17 October 2014.