Britain has joined a European air defence coalition with nine other countries including Ukraine.Sir Keir Starmer today joined French President Emmanuel Macron, as well as the leaders of Denmark, Germany, Italy, the Netherlands, Norway, Spain and Sweden in establishing an integrated anti-ballistic missile alliance. A statement from France's presidency said: 'We believe that the protection of Europe requires a global solution of integrated missile defence architecture to deter and defeat future missile threats — developed through collective effort, technological openness, and trusted industrial cooperation. 'It will complement existing ballistic missile defence systems, including sovereign European solutions already acquired, or to be acquired by participating countries.'The Prime Minister could be seen giving Mr Macron a warm embrace at the Coalition of the Willing summit at the Hotel des Invalides in Paris on Monday.With Ukraine increasingly exposed to Russian ballistic missiles, leaders gathered in the French capital, along with about a dozen firms from the defence sector, to press on with what they called the Integrated Anti-Ballistic Missile Coalition. The country is critically low on munitions for its systems and over the past month has been largely unable to down ballistic missiles, which travel at several times the speed of sound.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. French President Emmanuel Macron, pictured left, and British Prime Minister Sir Keir Starmer attend the Coalition of the Willing summit in Paris on Monday Pictured, first row from fifth right: Mr Macron, Ukrainian President Volodymyr Zelensky and Sir Keir with participants of the Coalition of the Willing summit at the Hotel des Invalides in Paris Mr Zelensky pictured at the Coalition of the Willing summit on security guarantees for Ukraine at the Hotel des Invalides in Paris on MondayAs Russia's strikes have increased, Kyiv has intensified drone attacks inside enemy lines, targeting oil facilities and weapons production as it shifts the battlefield momentum in the war.Ukrainian President Volodymyr Zelensky joined some 25 leaders for a broader summit of the Coalition of the Willing, part of efforts that include putting together a common position that could be taken to Russia, and security guarantees to support any eventual peace deal.The meetings come days after a NATO summit that aimed to show transatlantic unity and long-term support for Ukraine.Russia has stepped up strikes on Kyiv and the surrounding region in recent weeks, killing dozens. Officials said Russian missile and drone attacks across Ukraine on Saturday left eight dead and many more wounded.Moscow says it only attacks targets of military relevance and denies targeting civilians.Mr Zelensky had said prior to Monday's meeting that several countries were likely to formalise the Freyja project — Ukraine's attempt to build a European-backed, lower-cost alternative to the Patriot system.'Our work on a joint system – Freyja – is not intended to replace existing systems,' Zelensky said after Monday's announcement. 'It is a way to supplement our defence, create a strong shield over the entirety of Europe, and do all of this faster and at a lower cost.'A French presidency official said the meeting would also see how more U.S. Patriot interceptors could be sourced and how to advance the deployment of the Franco-Italian SAMP-T air defence system.About a dozen companies from across Europe, including the SAMP-T manufacturer Eurosam, Leonardo, Thales, Saab as well as Ukraine's Fire Point were among those attending.The leaders meeting in Paris were also discussing how to crimp Moscow's sources of revenue, notably the 'shadow fleet', tankers with opaque ownership ⁠structures used to evade oversight to ship Russian oil.The EU is set to adopt a 21st package of sanctions on Russia next week. Mr Macron, pictured left, greets Sir Keir ahead of the Coalition of the Willing summit Pictured L-R: German Chancellor Friedrich Merz, Mr Zelensky, Mr Macron, Sir Keir, and Polish Prime Minister Donald Tusk attend the Coalition of the Willing summitThe coalition also announced joint military exercises as it sought to make the concept of a future multinational force in Ukraine (MNFU) more of a practical reality.The French official said: '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.'It's not a question of conducting exercises in Ukraine.'