Rubio's meeting with Wang, which was confirmed by a State Department official, comes amid a fragile truce between the global superpowers that could be complicated by US President Donald Trump's accusations last week of Chinese meddling in US elections, which Beijing has denied.

The wider meeting in Manila takes place amid renewed hostilities and a potential new front in the conflict between the US and Iran, and as diplomatic tension flares between Beijing and close US ally the Philippines over an incident in the South China Sea that led to the summoning of ambassadors in both capitals.

Rubio joined a meeting early on Wednesday with the foreign ministers of the Association of Southeast Asian Nations, where he is expected to stress Washington's commitment to stand up for maritime rights in the South China Sea and honor US obligations to regional allies.

In an opinion piece in Philippine media published on his arrival in Manila on Tuesday that took aim at Beijing, Rubio said Southeast Asian countries are confronting "new and coercive threats" and the US was committed to upholding freedom of navigation.

"That freedom is by no means guaranteed. If those waters fall under the control of a power willing to use commerce as a geopolitical weapon, both the United States and the ASEAN states would face dire new threats to their sovereignty, security, and economic futures," Rubio wrote.

‘Interfering factors’

Beijing claims sovereignty over almost the entire South China Sea via a line on its maps that cuts into the exclusive economic zones of the Philippines, Malaysia, Vietnam, Brunei and Indonesia, and is at the center of long-running disputes over a multitude of islands and features.

Wang is due to meet on the sidelines on Wednesday with Philippine Foreign Secretary Maria Theresa Lazaro, the chair of the ASEAN-led gathering.

Rows between the Philippines and China have increased in recent years as President Ferdinand Marcos takes a bolder stance on the South China Sea, while pursuing closer defense ties with Washington and expanding security relationships with Australia and Japan.

In talks with ASEAN's Secretary-General Kao Kim Hourn on Tuesday, Wang said certain elements of the Philippines' security apparatus had "deliberately engaged in provocations and created maritime incidents", according to Beijing's readout of the meeting.

Wang said that served the interests of "external forces", adding the South China Sea issue should not be an obstacle in its relations with ASEAN and Beijing was willing to work with the bloc to "eliminate interfering factors".

Australia, Russia, Japan, Canada, South Korea, Britain, the European Union and India are also attending the meetings in Manila.

Analysts have said a meeting between Rubio and his Chinese counterpart would likely focus on preparations for a second meeting between Trump and Xi after the two met last May.

Trump has said Xi will visit the US at the end of September, and Rubio on Sunday said the summit was still anticipated.

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