Meet Agent Elvira, the Russian ‘black widow’ spy executed by ISIS

Elvira KaraevaThe female Russian spy executed by ISIS after spending four years working undercover within the terror group, had four Islamist husbands who all died in mysterious circumstances.

Elvira Karaeva, 28, reportedly infiltrated an ISIS enclave in Russia’s Caucasus region and spent years leaking information, which led to the assassinations of at least seven fighters.