The French president and the PM are co-hosting the Franco-British Summit on the final day of Macron's state visit to the UK.

The two leaders are set to confirm details of a strengthened defense relationship at a summit Thursday. An agreement on tackling unauthorized migration may also be announced.

Britain and France will join together to use nuclear weapons against any “extreme threats” towards Europe, Sir Keir Starmer and Emmanuel Macron have declared. A newly-signed declaration by the leaders will state that the two countries’ nuclear deterrents are independent but can be co-ordinated in a joint attack on Europe’s enemies.

King Charles III highlighted the crucial bonds between the United Kingdom and France in the face of a “multitude of more complex threats,” as he welcomed President Emmanuel Macron for the first state visit by a European leader to his country since Brexit.

Macron’s three-day visit is a symbol of the British government’s desire to reset relations with the E.U., which the U.K. acrimoniously left in 2020.

King Charles and French President Emmanuel Macron shared a notably warm and extended farewell at Windsor Castle, marking a successful start to the French leader’s state visit. At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.

French President Emmanuel Macron arrived in London on Tuesday at the start of a three-day state visit to the United Kingdom. This is a photo gallery curated by AP photo editors.

French President Emmanuel Macron's state visit to Britain turned to politics Wednesday as London is expected to press Paris for new measures to curb undocumented immigration.The number of migrants arriving on England's southern coast via small boats from northern France is a major political issue for Labour Prime Minister Keir Starmer.