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![BELGIUM-BRUSSELS-EU-SUMMIT](136826401_15132567776521n.jpg)
European Council President Donald Tusk arrives at EU headquarters prior to an EU Summit in Brussels, Belgium, Dec. 14, 2017. (Xinhua/Ye Pingfan)
European Council President Donald Tusk arrives at EU headquarters prior to an EU Summit in Brussels, Belgium, Dec. 14, 2017. (Xinhua/Ye Pingfan)