The Nato Secretary General Jens Stoltenberg has marked the alliance's 75th anniversary by saying "we must be doing something right". It has grown from 12 countries at its inception to 32. Its newest members, Sweden and Finland, abandoned their neutrality and joined the alliance as a result of Russia's full-scale invasion of Ukraine. Addressing a ceremony in Brussels, Mr Stoltenberg said the alliance's success came from the interdependence of its North American and European members. The former and possibly future US president, Donald Trump, has repeatedly voiced scepticism about Nato.