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Photo taken in Arlington, Virginia, the United States, on Aug. 16, 2021 shows a screen displaying U.S. President Joe Biden delivering remarks on Afghanistan at the White House in Washington, D.C. Biden said Monday that the deteriorating situation in Afghanistan "did unfold more quickly" than the United States had anticipated, adding, however, that he stands by the decision to withdraw U.S. troops from the war-torn country. (Xinhua/Liu Jie)