The King will stress the vital partnership between France and the UK in the face of a "multitude of complex threats" as he welcomes the French President to a State Visit today. Charles and Queen Camilla will host Emmanuel Macron and his wife Brigitte at Windsor Castle ar the start of a three-day visit to the UK.
As France and the UK are expected to announce a joint plan on small boat crossings, the King will highlight how “these challenges know no borders”, adding “no fortress can protect us against them this time”. At a glittering banquet in the historic Berkshire landmark in the evening, the monarch will deliver a speech, adding: “as friends and as allies, we face them together”.

The King will also tell Mr Macron that Britain and France can help lead the way in confronting threats relating to defence, technology and climate change, saying: "Our two nations share not only values, but also the tireless determination to act on them in the world."
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Charles and Camilla are hosting Mr Macron and the first lady at the historic royal residence. They will be feted with a carriage ride through the town, a ceremonial welcome and the opulent state dinner.
The King, in his toast, will reflect on 1,000 years of "shared history and culture between our two peoples", including many of the royal family's personal connections to France.
"For centuries our citizens have admired each other, amused each other, and imitated each other", he will say, and reveal how he remains "in awe of France's extraordinary attributes and achievements".
Charles will also hail the Anglo-French partnership as vital amid the many challenges of today, saying: "Our two countries face a multitude of complex threats, emanating from multiple directions. As friends and as allies, we face them together."
It marks the first state visit to the UK by an EU head of state since Brexit, and will see Mr Macron address parliamentarians in the Palace of Westminster's Royal Gallery and, on Thursday, join a UK-France Summit at Downing Street.
Prime Minister Sir Keir Starmer has signalled a "reset" in relations between the UK and Europe as he looks to heal the wounds caused by the Brexit years.
Defence, growth, security, migration and French tactics on tackling small boats will be discussed, with the two leaders expected to dial in to speak to other allied nations who are looking to support any future peace deal in Ukraine.
Downing Street said on Monday that the UK's relationship with France was "key" to dealing with boat crossings, following reports French police officers had used knives to puncture a boat off the coast.
The Prince and Princess of Wales will also play a role by meeting the president and the French first lady at RAF Northolt this morning on behalf of the King and travelling with them to Windsor.
Charles and Camilla will formally greet their guests on a Royal Dais constructed on Datchet Road in Windsor town centre, with the castle in the backdrop as gun salutes sound in nearby Home Park.
The King, the Queen, the Waleses and Mr and Mrs Macron will then take a carriage procession through Windsor and along part of the Long Walk which leads to the castle, just as former French president Nicolas Sarkozy did in 2008.

Mr Macron's state visit to the UK is the first to be hosted at Windsor Castle, rather than Buckingham Palace, in a more than a decade since that of the Irish president Michael D Higgins in 2014.
State visits, which capitalise on the royals' soft power to strengthen diplomatic ties overseas, will be hosted at Windsor for the next few years while reservicing work continues at the London Palace and starts to affect the state rooms.
The last state visit to the UK from France was in March 2008 when the now-disgraced Mr Sarkozy, since convicted of corruption and influence peddling, and his wife Carla Bruni, were the guests of Elizabeth II at Windsor.
The arrangements are likely to form the template for US President Donald Trump's high-profile state visit in September, but much will depend on security considerations for the US leader, who survived an assassination attempt last year.
A ceremonial welcome will be staged in the castle's quadrangle with Camilla, William, Kate and Mrs Macron watching as the King and Mr Macron inspect the Guard of Honour.
Lunch will be hosted in the State Dining Room, after which the president and his wife, the King and Queen and members of the royal family will view a special exhibition of items relating to France from the Royal Collection in the Green Drawing Room. Mr and Mrs Macron will also travel to London on Tuesday afternoon to see the Grave of the Unknown Warrior at Westminster Abbey and visit the Palace of Westminster where the French leader will address parliamentarians before meeting opposition leaders at Lancaster House.
The King and president will both deliver speeches at the banquet in the medieval St George's Hall, where some 160 guests will be seated at the elaborately decorated 50 metre table, which will run the full length of the vast room. Kensington Palace has yet to confirm whether Kate will attend the banquet.
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