 Hello, welcome to NewsHour from the BBC World Service. Coming to you live from London, I'm Paul Henley. At the NATO conference in Washington, the Alliance pledges to provide more military aid to Ukraine, much to Russia's annoyance. Also on the programme, could a press conference by President Biden be a defining moment in his battle to beat Donald Trump to the next presidency? And we'll hear the story of a teacher from Gaza killed shortly before he was due to escape from the war.