Aleksei Alexeyevich Oleinik (born June 25, 1977, as Oleksíy Oleksíyovych Olíynyk) is a Russian mixed martial artist and combat sambo fighter who fought for the Ultimate Fighting Championship, competing in their heavyweight division. He began his professional fighting career in 1997, and is a veteran of M-1 Global, ProFC and IAFC and has competed for Bellator, KSW and YAMMA Pit Fighting. He is one of only two fighters to win a UFC fight via Ezekiel choke, and has done so twice. Oleinik also holds the record for most Ezekiel choke wins in MMA competition, with fourteen.