King Charles III will highlight the crucial bonds between the United Kingdom and France in the face of a “multitude of complex threats” as he welcomes President Emmanuel Macron for the first state visit by a European leader since Brexit.

French President Emmanuel Macron was welcomed Tuesday in London by Britain's King Charles III for a three-day state visit in the first since 2008 by France's leader.

Kate, the Princess of Wales, joined her husband Prince William, King Charles III and Queen Camilla on Tuesday as they kicked off France's state visit to the U.K. The royals gathered at RAF Northolt in Windsor, England, to welcome French President Emmanuel Macron and his wife Brigitte, at the start of their state visit.