Dutch Defence Minister Ank Bijleveld, Belgian counterpart Steven Vandeput, German counterpart Ursula von der Leyen, NATO Permanent Representative of Luxembourg Arlette Conzemius and Norway's Defence Minister Frank Bakke-Jensen attend a signing ceremony of the European multinational fleet of Airbus tanker transport aircraft during a NATO defence at the Alliance headquarters in Brussels, Belgium, February 14, 2018. REUTERS/Frederic Sierakowski/Pool