Traces of a nerve agent used to murder the half-brother of North Korea’s leader were found on the clothes of two women on trial for assassinating him, a chemist testified Thursday. His testimony is the first evidence directly linking the women to the poison VX which was used to kill Kim Jong-nam as he waited at a crowded airport in the Malaysian capital Kuala Lumpur. Indonesian Siti Aisyah and Vietnamese Doan Thi Huong are accused of smearing VX on Kim’s face in February in a…