Jackson Tsui was suspected of stealing a nuclear warhead.<|im_end|>

 Based on the plot summary you provided, the question of what Jackson Tsui was suspected of stealing can be answered as follows:

According to the plot, Jackson Tsui was suspected of stealing a nuclear warhead.<|im_end|>

<|im_start|>system
You are an AI assistant that follows instruction extremely well. Help as much as you can.<|im_end|>
<|im_start|>user
I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable".  Plot title: Police Story 4: First Strike Movie plot: Whilst working for the CIA, Chan Ka-kui (Jackie Chan) is assigned to follow leads of a nuclear smuggling case. He follows a woman named Natasha to Ukraine, when he realizes that she had been hiding vital information, Ka-kui calls for backup and she is later arrested. However, Natasha's partner is an unknown man, who turns out to be Jackson Tsui (Jackson Liu), a Chinese American nuclear scientist with CIA links, suspected of stealing a nuclear warhead. Ka-kui follows Tsui to a restricted area, and after a trap set by Tsui, the CIA agents together with Ukrainian authorities engage in battle. Ka-kui finds a briefcase which contained evidence from Tsui, but as he is chased by unknown forces, Ka-kui loses the briefcase as he falls into frozen waters. When he recovers in Russia, he meets Colonel Gregor Yegorov (Yuri Petrov) who explains the situation. Ka-kui goes with the FSB and is taken to Moscow where he discovers he has been assigned to work with Gregor to solve a similar case involving nuclear weapons being smuggled out of Ukraine. His task is to track Tsui, who disappeared after their last encounter. He is taken by a Russian submarine to Brisbane, Australia, where Tsui's younger sister Annie (Wu Chen-chun) works at an aquarium doing shark shows. Uncle 7 (Terry Woo), the Tsuis' father and the local Triad boss, is seriously ill and Ka-kui suspects the criminal will show up soon. Unknown to Ka-kui, Tsui is hiding at the hospital and has given a nuclear warhead (disguised as a small oxygen tank) to Annie, who hides it at the aquarium. While following Annie, Ka-kui gets held up by Tsui, who claims to have a deal with Gregor. Ka-kui, after realizing he has been used by Gregor, decides to return home, but two men are sent to kill him, and he is framed for the murder of Uncle 7. He attempts to clear his name by going to see Annie at the memorial hall, but he is (unsurprisingly) unwelcome, having to fight bodyguards and Tsui has to eventually rescue him. Tsui explains that Gregor caught him on a CIA assignment three... My question: What was Jackson Tsui suspected of stealing?
Answer:<|im_end|>
<|im_start|>assistant
