Foreign ministers from the Group of Seven nations meet in Paris on Monday for two days of talks that will give Washington's allies their first chance to measure how the US midterm elections have changed President Donald Trump's foreign policy.

The gathering, moved at short notice from Marseille to Paris after weeks of protests across France, brings together Britain, Canada, France, Germany, Italy, Japan and the United States, alongside the European Union. Ministers from Ukraine, Saudi Arabia, Egypt, South Korea and Brazil are also attending some sessions.

US Secretary of State Marco Rubio will attend both days, his first appearance before allies since the elections. Rubio, seen as a potential 2028 presidential contender, declined to comment on the midterm result as he left for France.

Ukraine tops the agenda, ahead of trilateral talks on Tuesday in Abu Dhabi between Ukraine, Russia and the United States. European ministers want Washington to seek a fair settlement rather than one forcing Kyiv to accept disadvantageous terms, and France has confirmed Europeans will take part in Abu Dhabi.

Diplomats warned that Russia has shifted tactics towards systematically targeting energy infrastructure in an effort to trigger a nationwide winter blackout, and that shortages of Patriot interceptors were Kyiv's most urgent vulnerability.

Iran is also expected to feature prominently. European powers are expected to press the United States to seek a settlement and to deter Washington from further military action against Tehran, even as the administration has not ruled out new strikes. The ministers will also discuss freedom of navigation in the Strait of Hormuz and the Red Sea, energy security and recent cyber attacks.

The Democrats' gains could narrow the White House's room for manoeuvre, but warned against expecting a return to traditional US multilateralism while foreign policy remains firmly under Trump's control.