Timor Leste will become ASEAN's newest member, a historic moment for the nation given President José Ramos Horta once said that it was easier to get into heaven than ASEAN.

But the headline of the summit is the attendance of US President Doanld Trump. 

The attendance of any US president at the ASEAN summits is seen as a test, of the group’s international relevance, and US interest in the region. What do all the parties want from the visit?