[3] He was convicted by judicial authorities in Colombia for training several members of Colombian paramilitary groups and the militias of drug traffickers, including Gonzalo Rodríguez Gacha and Pablo Escobar Gaviria.
In a 2007 interview with Caracol TV, Klein claimed that he was sent to Colombia by request of the National Police in order to train its members, and stated that he was willing to go back and help destroy the FARC guerrillas.
During the trial, he explained that he pleaded guilty "to put an end to the witch hunt running rampant in some of the press, based on rumours and speculation which are harming the state and me."
On 3 April 2007 Interpol issued an international arrest warrant for Klein and two other Israeli collaborators, Melnik Ferri and Tzedaka Abraham, on charges of criminal conspiracy and instruction in terrorism.
[9] Despite the authorization given by a Russian tribunal to extradite Klein to Colombia, the European Court of Human Rights decided to suspend the surrendering of the suspect.
[13] Klein then returned to Israel, calling the international arrest warrant "complete nonsense" and announcing his intention to begin writing books.