The gathering in Brussels is billed as a "triple first": the first time the European Union's 27 leaders meet since the US president's inauguration, their first-ever dedicated talks on defence and their first with a British premier since Brexit.

European Union leaders gather on Monday to discuss how to bolster the continent's defences against Russia and how to handle U.S. President Donald Trump after his decision to impose tariffs on goods from Canada,

European nations weigh increased defense investment as concerns grow over security and transatlantic relations.