From 2ndL, Belgium’s King Philippe, NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump, Montenegro’s Prime Minister Dusko Markovic, Lithuania’s President Dalia Grybauskaite, Croatia’s President Kolinda Grabar-Kitarovic and Dutch Prime Minster Mark Rutte walk together inside the new NATO headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Kevin Coombs