Joan's information is only given to Sonia, so that Leo's status is not as high as Sonia. Leo believes that Joan’s information should belong to Sonia and him, and should share the honor given by the organization, and cannot be unique to Sonia. Sonia’s desire exceeds physical needs and love), as a "husband and wife" who really live together, she is usually dissatisfied with the organization, and Sonia reported it to KGB. Then, the pocket watch proved that Sonia was on the scene when Leo was killed.
The photos on the train show that Joan's son was born to Leo and Sonia.
In addition, historical common sense.
Before the Soviet Union successfully tested the nuclear bomb, Stalin opposed North Korea's use of force against South Korea and even asked other Communist Parties to form a coalition government. When the Soviet Union succeeded in the nuclear explosion, he immediately supported Kim Da Pang's use of force and asked China to send troops. In other words, the death of the volunteer army and the death of thousands of people on the Korean Peninsula have a lot to do with this woman.
She said it was for peace, but in fact it was to create war.
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