SEOUL—Kim Jong Un tried peace talks and refrained from testing new weapons to shed North Korea’s status as a pariah state. Now he is doubling down on rogue behavior to get what he wants.

       By recently sending thousands of troops to the Russian front lines, Kim has opened a new chapter for his cash-strapped regime. The move thrusts the “Hermit Kingdom" into global affairs in a way that it has shunned since the 1950-53 Korean War.

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