US president Donald Trump and his wife Melania made a visit to Pearl Harbor before embarking on a trip to Asia that will take in five nations in 11 days. It will be the longest trip to Asia by an American president in more than a quarter of a century, with stops in Japan, South Korea, China, Vietnam and the Philippines. Alongside trade talks, the issue of North Korea will hang over Trump’s meetings with Asian leaders.

• North Korea looms large as Donald Trump embarks on Asia trip