Ukrainian President Volodymyr Zelenskiy will be joined by at least 25 leaders for a meeting of the Coalition of the Willing on Monday, part of broader efforts that include putting together a common position that could be taken to Russia, and security guarantees to support any eventual peace deal.
The talks will be led by France and the UK and the German government has confirmed that Chancellor Friedrich Merz will attend.
The meeting comes days after a NATO summit that aimed to show transatlantic unity and long-term support for Ukraine.
Russia launched missile and drone attacks on Ukraine on Saturday, killing eight people and wounding dozens more, officials said, as Zelenskiy called for efforts to provide Kyiv with weapons faster.
"The ballistic missiles launched by (Russian President) Vladimir Putin are deliberately targeting civilian zones and June was one of the most murderous (months) since the start of the war," Foreign Minister Jean-Noel Barrot said in an interview with Ouest-France newspaper on Sunday.
Russia says it only attacks targets of military relevance and denies targeting civilians.
A French presidency official said the focus would be anti-ballistic-missile co-operation ranging from sourcing more US Patriot interceptors and advancing the deployment of the Franco-Italian SAMP-T air defence system to looking at how the European and Ukrainian defence industries can develop alternatives.
One option under consideration was for different European nations to co-operate on a system that would complement SAMP-T and/or Patriot and give Ukraine a significant role in production.
Ukraine is critically low on munitions for its systems and has been largely unable to down ballistic missiles, which travel at several times the speed of sound, over the past month.
It has pleaded with allies for more supplies and has also pushed Europe to work with it on its own anti-ballistic air defence system.
As Russia's strikes have increased, Kyiv has also intensified drone attacks inside Russia, targeting oil facilities and weapons production to undermine Moscow's economic ability to press on with its war.
Leaders will also mull how to crimp Moscow's sources of revenues, notably the "shadow fleet", tankers with opaque ownership structures used to evade oversight to ship Russian oil.
The EU is also set to adopt a 21st package of sanctions on Russia next week.
French President Emmanuel Macron has promised announcements on Monday, some of them bilateral, potentially concerning joint arms production.
He also said the coalition could announce joint military exercises as it seeks to make the concept of a future multinational force in Ukraine more of a practical reality.
"What must be remembered is that the MNFU consists of land, air, sea and training. All of these pillars are intended to be tested continuously, to varying degrees, with all participants in order to guarantee their credibility," the official said.
"It's not a question of conducting exercises in Ukraine."
with DPA
