US Secretary of State Marco Rubio has joined a meeting of G7 foreign ministers in France for talks where the US-Israeli war with Iran will be the main focus.

Rubio is expected to face pressure to de-escalate the conflict as concerns continue to grow over its impact on the world economy.

The other G7 countries – the UK, Canada, France, Germany, Italy, and Japan – are wary of being drawn in militarily. The group will also discuss the war in Ukraine.

As he headed to France, Rubio said it was in the interest of the G7 to step up and help with the Strait of Hormuz, which Iran has effectively blockaded, causing fuel prices to soar.

As they went into the meeting, UK Foreign Secretary Yvette Cooper told the media: We need to see a swift resolution to this conflict that restores the regional stability, that needs to include the Strait of Hormuz.

About 20% of the world's oil and liquefied natural gas typically passes through the strait and the war has caused concern over price rises and potential shortages.

Ministers from the G7 have previously said they are ready to take necessary measures to support the global energy supply.

At a meeting of the ministers on Thursday, German Foreign Minister Johann Wadephul said the group should develop a common position with the US to help bring the war to a swift end.

He added that the talks with Rubio would be important and that France and Britain share the same position.

Hours before Rubio headed to France, US President Donald Trump again criticised NATO, stating allies in the military alliance had done absolutely nothing to help with the situation.