By James Pearson and Jack Kim SEOUL (Reuters) - The bizarre assassination of North Korean leader Kim Jong Un's estranged half-brother marks a departure from the isolated country's repertoire of overseas operations, according to experts on its opaque ruling structures. Kim Jong Nam died last week after being assaulted at the airport in the Malaysian capital with what police believe was a fast-acting poison. South Korea has said that it believes the assassination was coordinated by a shadowy North Korean agency called the Reconnaissance General Bureau (RGB).



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