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NATO Secretary General Jens Stoltenberg speaks at a joint press conference with Polish President Andrzej Duda (not in picture) at Belweder Palace in Warsaw, Poland, on May 28, 2018. (Xinhua/Maciej Gillert)

NATO Secretary General Jens Stoltenberg speaks at a joint press conference with Polish President Andrzej Duda (not in picture) at Belweder Palace in Warsaw, Poland, on May 28, 2018. (Xinhua/Maciej Gillert)