Luxembourg's Prime Minister Xavier Bettel (L), French President Emmanuel Macron (C) and German Chancellor Angela Merkel walk to attend the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
British Prime Minister Theresa May (L, front), Turkish President Recep Tayyip Erdogan (C, front), Czech Republic President Milos Zeman (R, front) and other NATO member states leaders attend the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
King Philippe of Belgium (L) is accompanied by NATO Secretary General Jens Stoltenberg to attend the Handover Ceremony at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
U.S. President Donald Trump (L) and British Prime Minister Theresa May (R) attend the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
King Philippe of Belgium, NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump, British Prime Minister Theresa May (from L to R, front) and other NATO member states leaders watch air show at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
Soldiers stand by at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
NATO Secretary General Jens Stoltenberg (L, front) talks with U.S. President Donald Trump (R, front) at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
Belgium's Prime Minister Charles Michel speaks during the inauguration of the new NATO Headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
Croatian President Kolinda Grabar-Kitarovic (L, front), U.S. President Donald Trump (C, front) and Slovenian Prime Minister Miro Cerar (R, front) walk to attend the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
Aircrafts fly over the NATO new headquarters at its handover ceremony during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
Luxembourg's Prime Minister Xavier Bettel (C, front) talks with French President Emmanuel Macron (R, front) after the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump, British Prime Minister Theresa May (from L to R, front) and other NATO member states leaders attend the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
King Philippe of Belgium (2nd L, front) shakes hands with U.S. President Donald Trump (3rd L, front) when he leaves the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
NATO Secretary General Jens Stoltenberg speaks during the inauguration of the new NATO Headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
French President Emmanuel Macron (L) talks with Croatian President Kolinda Grabar-Kitarovic at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
German Chancellor Angela Merkel, Luxembourg's Prime Minister Xavier Bettel, Albanian prime minister Edi Rama, French President Emmanuel Macron, Lithuanian President Dalia Grybauskaite, Dutch Prime Minister Mark Rutte and Hungarian Prime Minister Viktor Orban (from L to R) talk during air show at the handover ceremony of the new NATO headquarters during a one-day NATO Summit, in Brussels, Belgium, May 25, 2017. (Xinhua/Ye Pingfan)
