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European Union's chief Brexit negotiator Michel Barnier attends a seminar about the future of EU foreign, security and defence policy in post-Brexit era in Brussels, Belgium, May 14, 2018. (Xinhua/Ye Pingfan)

European Union's chief Brexit negotiator Michel Barnier attends a seminar about the future of EU foreign, security and defence policy in post-Brexit era in Brussels, Belgium, May 14, 2018. (Xinhua/Ye Pingfan)