Iran and the US held their fire Monday, handing Gulf shipping and the oil industry a respite from missile strikes as Donald Trump's UN envoy said the president was "giving talks some space".
The latest talks come after the US resumed attacks on Iran in an effort to end Tehran's control of the strait
Visiting US Secretary of State Marco Rubio this week warned ASEAN envoys that Iranian control of the Strait of Hormuz would set a "dangerous precedent".
Britain in June withdrew its embassy staff from Iran, following in the footsteps of other European nations as well as Australia and New Zealand.
Trump pledged that the US would bomb Iranian civil infrastructure.
Iran targeted US radar and air defence installations in the Gulf on Tuesday, warning Washington of "more decisive and powerful" attacks to come.