By Liz Lee and Rozanna Latiff KUALA LUMPUR (Reuters) - Malaysian Prime Minister Najib Razak rebuked North Korea on Monday as his government expelled its envoy for casting doubt over the impartiality of the investigation into the bizarre murder of the North Korean leader's estranged half brother. If North Korean agents did kill Kim Jong Nam, as U.S. officials and South Korean intelligence suspect, the decision to assassinate him on Malaysian soil could cost the isolated, nuclear-armed state one of the few friends that it has. Malaysia's outrage over last month's killing of Kim Jong Nam at Kuala Lumpur International Airport was heightened by the assassins' use of VX nerve agent, a chemical so toxic that it is on a U.N. list of weapons of mass destruction.



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