By Stephanie Nebehay and Joseph Sipalan GENEVA/KUALA LUMPUR (Reuters) - South Korea called for "collective measures" to punish North Korea for using chemical weapons to kill the estranged half-brother of its leader Kim Jong Un, as Malaysia said on Tuesday it would charge two women with murder over the airport attack. Police have said the women smeared VX nerve agent, a chemical on a United Nations list of banned weapons of mass destruction, on Kim Jong Nam's face in an assault captured on security cameras in the Malaysian capital's airport on Feb. 13.



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