Helping the captain
Alexi Leonov heard many good stories about Oliver Queen by Anatoly Knyazev, the leader of the Solntsevskaya Bratva in Moscow. However, Anatoly never liked Alexi for an unspecified reason. At some point, Alexi relocated to Starling City, where he ran a garage as a cover for his illegal activities.
In October 2012, Alexi encountered Oliver Queen in his garage, who was looking for the former to get help locating Deadshot through his trademark bullets. At first, Alexi thought him to be an enemy, but Oliver proved his credence by showing him his Bratva tattoo. Apologizing, Alexi brought Oliver downstairs. As they drank vodka, he agreed to look into the bullets and discover the sniper's whereabouts. However, Alexi warned that he would have Oliver and his family killed if the latter was lying about his position.
That night, Alexi called Oliver to confirm Deadshot's identity as Floyd Lawton and revealed he was staying in the Papp Motel, where he resided the last time he had been in the city. Before hanging up, Alexi requested that Oliver keep the Bratva out of his business with the assassin.
Sometime later, Oliver asked him to arrange a meeting with The Count so that he could buy the drug Vertigo. Alexi revealed that he had learned of Oliver's identity and was surprised that an American had gained such a high rank in the Bratva. He agreed to try to arrange a meeting if Oliver could perform a task for him. He brought in a man, claiming that he did something against his wishes, and asked Oliver to kill him. Oliver used a move Yao Fei Gulong had once used on him, making it appear as if the man was dead. Tricked by the manoeuvre, Alexi arranged the meeting for Oliver and attended it, but a police raid interrupted the deal and Alexi and company fled.
Oliver again asked for Alexi's help, in order to uncover intel on Slade Wilson. As usual, Leonov asked a favor in return, but Oliver refused to comply, taking out and injuring his men in order to persuade Leonov to do this favor. Alexi obliged but informed him that he would no longer be associated with the Bratva, regardless of who his friends were. A short while later, Alexi was killed with an arrow to the eye and was taken to Slade Wilson's office, where he was found by Oliver.
Alexi was a "you scratch my back, I scratch yours" type of mobster. While doing favors for Oliver Queen, he always expected one in return. Alexi was however, not unreasonable as the first favor he did for Oliver was free since he and his mechanic disrespected Oliver without realizing he was Bratva, moreover, a captain. Alexi didn't like dirtying his hand, as he requested Oliver to kill a man for him in exchange for looking into Count Vertigo. He couldn't compromise for an emergency request and still demanded a favor first, as per the rules.
- High-level intellect/Expert tactician: As a member of the Solntsevskaya Bratva, Alexi is an excellent tracker and tactician. He was able to locate Floyd Lawton based on a previous visit to Starling City and arrange a meeting with the elusive Count Vertigo.