Yuri Boyka, a skilled MMA fighter from Ukraine, is forced to participate in an underground fighting tournament in Russia to pay off a debt owed by the widow of his last opponent, Victor. Boyka's goal is to win three matches and earn the widow's freedom from the tournament's organizer, Zurab, a crime boss. Despite being a wanted man in Russia, Boyka takes the risk and faces several tough opponents, including Igor and the notorious Koshmar. Boyka emerges victorious but not without scars, and in the process, earns the respect of Victor's widow, Alma. However, Zurab tries to double-cross Boyka, leading to a violent confrontation that ends with Zurab's death. Boyka is arrested and imprisoned, but eventually earns Alma's forgiveness. The movie ends with Boyka continuing to fight in the prison arena, still holding the title of the undisputed champion.
Here are the key facts from the text:
1. Yuri Boyka is an MMA fighter from Kiev, Ukraine.
2. Boyka is known as the best fighter in Europe and has the title of the undisputed.
3. Boyka participates in an underground fight in Kiev.
4. Boyka wins the fight, but his opponent is left severely injured.
5. Boyka feels guilty for hurting his opponent so badly.
6. Boyka's opponent, Victor, dies from his injuries.
7. Boyka decides to go to Russia to meet Victor's wife, Alma.
8. Alma is struggling to make ends meet and is in debt to a crime boss named Zurab.
9. Boyka agrees to fight for Zurab in exchange for paying off Alma's debt.
10. Boyka wins three fights against Zurab's opponents.
11. After winning the fights, Boyka is forced to fight against Koshmar, a notorious fighter from a Russian prison.
12. Boyka wins the fight against Koshmar, but not before being severely injured.
13. Boyka kills Zurab and his minions in a final confrontation.
14. Boyka is shot and arrested by the police.
15. Alma forgives Boyka for his role in her husband's death.
16. Boyka is imprisoned in a Russian prison, where he continues to fight and hold the title of the undisputed.