Trump-Kim first encounter will be a precise 20-minute one-on-one meeting at 18:40 local time (11:40 GMT). The meeting will be followed by dinner with their aides at Hanoi, according to the White House.
The two leaders will attend a series of meetings together on Thursday, but their exact agenda is unknown.
It’s expected that any major events – the signing of agreements or significant press conferences – will take place on Thursday.