Igor Nikolayevich Bezler (Russian: Игорь Николаевич Безлер; Ukrainian: Ігор Миколайович Бєзлєр, romanized: Ihor Mykolayovych Byezlyer; born 1965, Simferopol,[2] Crimean Oblast, Ukrainian SSR), known by the pseudonym "Bes" (Russian: Бес, English: Imp)[3] is one of the pro-Russian rebel leaders whose group controlled the local police department in Horlivka.

The Security Service of Ukraine (SBU) claims that until 2002 he served in detachments of the Russian General Staff GRU retiring as a lieutenant colonel.

Complying with their instructions, Bezler supposedly moved to Crimea where he participated in number of violent events connected with taking over of military installations and government facilities.

In April 2014, as a member of a diversion group, Bezler helped take over the SBU headquarters in Donetsk Oblast and the Interior Ministry district department in Horlivka.

Ukraine accused him and Igor Strelkov of orchestrating the killing of Horlivka deputy Volodymyr Ivanovych Rybak.

[17] Shaun Walker, a reporter for The Guardian, claims that Bezler "is regarded as something of a loose cannon, even by other rebels, who speak about him in hushed tones."

"[19] In November 2014 Bezler disappeared from public sight in Donbas and speculations about his death was circulated by some Ukrainian media (including a version that he was assassinated by Russian special services).

[23] On December 19, 2014, Bezler was placed on the Specially Designated Nationals List by the U.S Office of Foreign Assets Control (OFAC).