John and Jack arrive at Chernobyl in the Ukraine where they find Russians carrying out armored boxes. They locate Komarov in the vault, surrounded by more boxes. When asked about the file, he admits there never was one...it was the boxes containing a billion euros worth of U-235, weapons grade uranium, that he was after. Suddenly, Komarov's daughter Irina (Yuliya Snigir) jumps in the room and fires a popshot at the McClanes. A full scale shoot out takes place during which Irina escapes to the rooftop where a transport helicopter is waiting. John goes after her and manages to climb into the cargo hold as the copter is taking off. Meanwhile, Jack has pursued Komarov to the roof, who is waiting to be picked up. Irina tries to cover him by firing on Jack, but John unbalances the helicopter by driving a truck, still shackled to the copter, right out of the hold, causing the helicopter to spin and swerve out of control. Back on the rooftop, Jack catches up with Komarov and tosses him off the rooftop. On his way down, Komarov falls into the whirling helicopter blades and is killed. John manages to leap out of the truck before it is demolished against the building. He and Jack reunite inside, but Irina takes her revenge by slamming the helicopter into the building. Jack and John both manage to escape the resulting explosion by jumping out of a window, landing in large pool of water. When John doesn't resurface immediately, Jack begins calling to him, first yelling, 'John!' but then changing to 'Dad!' In the final scene, John and Jack fly back to New York where they are greeted by John's daughter Lucy (Mary Elizabeth Winstead). After hugging her brother, the three McClane's walk off the tarmack together.