Nato Secretary General Jens Stoltenberg, right, and Belgium's Foreign Minister Hadja Lahbib cut a cake during a ceremony to mark the 75th anniversary of Nato at Nato headquarters in Brussels, Belgium. AP
Canadian Minister for Foreign Affairs Melanie Joly, US Secretary of State Antony Blinken and Luxembourg's Minister for Foreign Affairs Xavier Bettel at the ceremony. AFP
Mr Stoltenberg lays a wreath at the Flag Circle outside Nato Headquarters in Brussels. AFP
The Washington Treaty on display at Nato headquarters. AP
Delegates in attendance during the first day of the Nato foreign affairs ministers' meeting. Getty Images
Ministers of Foreign Affairs pose for a photo in Brussels. AFP
The Band of the Welsh Guards perform at Buckingham Palace in London, to celebrate the 75th anniversary of the signing of the North Atlantic Treaty. Reuters
The Band of the Welsh Guards marches at Buckingham Palace to mark the anniversary. PA
Flags of Nato and its member states are displayed along The Mall in London. Reuters
The Nato flag flies under the Cinquantenaire Arch in Brussels, Belgium. EPA
Ms Lahbib with the iconic Manneken-Pis, known as Manneken-Peace, dressed in a NATO uniform, in Brussels. PA
A commemorative euro coin to mark the 75th anniversary. AFP