By Michael Holden and Steve Holland
LONDON (Reuters) -U.S President Joe&nbsp;Biden&nbsp;arrived in London late on Sunday for the start of a three-nation tour that will include&nbsp;meetings with Prime Minister Rishi&nbsp;Sunak&nbsp;and a discussion on climate change with&nbsp;King&nbsp;Charles&nbsp;at Windsor Castle on Monday.
The White House had said the trip was designed "to further strengthen the close relationship between our nations".
The president, who flew into Stansted airport northeast of London late on Sunday, will travel to Downing Street on Monday to hold a low-key&nbsp;meeting with&nbsp;Sunak, their fifth in as many months.&nbsp;Sunak's spokesperson said the discussions would likely include the upcoming NATO summit and Ukraine.
"As we face&nbsp;new&nbsp;and unprecedented challenges to our physical and economic security, our alliances are more important than ever,"&nbsp;Sunak&nbsp;said in a statement released by his office.
"The UK is Europe's leading NATO ally, we are the United States' most important trade, defence and diplomatic partner, and we are at the forefront of providing&nbsp;Ukraine&nbsp;with the support they need to succeed on the battlefield," said&nbsp;Sunak, who studied at California's Stanford University and owns a penthouse flat in Santa Monica, in southern California.
Sunak&nbsp;has gone some way in repairing ties with&nbsp;Biden&nbsp;after the relationship cooled under his predecessors Boris Johnson and Liz Truss due to their tough stance over a post-Brexit deal with the European Union and Johnson's closer ties to Republican former President Donald Trump.
For&nbsp;Biden, the more high-profile part of the trip will be his&nbsp;meeting with&nbsp;King&nbsp;Charles&nbsp;at Windsor Castle, to the west of London, where the monarch's late mother, Queen Elizabeth, hosted Democratic President Barack Obama in 2016 and Trump in 2018.
Biden&nbsp;also met Queen Elizabeth at Windsor for tea in 2021.
The&nbsp;king&nbsp;will receive&nbsp;Biden&nbsp;in the quadrangle of the castle, where a guard of honour will give a Royal Salute and the U.S. national anthem will be played, the&nbsp;king's office said.
The president and the&nbsp;king&nbsp;are due to discuss climate issues, a subject on which&nbsp;Charles, 74, has campaigned and spoken out about for more than five decades.
When the two men met at the COP26 U.N. climate summit in Scotland two years ago,&nbsp;Biden&nbsp;praised&nbsp;Charles' leadership on the subject, telling him, "We need you badly".
"You are very kind for saying that,"&nbsp;Charles&nbsp;replied.
Biden&nbsp;met&nbsp;Charles&nbsp;at a reception during a visit for the funeral of Queen Elizabeth last year, but in keeping with longstanding practice of U.S. presidents, he did not attend the&nbsp;king's coronation in May.
U.S. special climate envoy John Kerry told the BBC he had been invited to brief the&nbsp;king&nbsp;and&nbsp;Biden&nbsp;about a climate finance conference that he was due to host with British energy minister Grant Shapps on Monday.
Following the&nbsp;meeting,&nbsp;Biden&nbsp;and&nbsp;Sunak&nbsp;will leave&nbsp;Britain&nbsp;for Lithuania where NATO leaders will gather for a key summit.&nbsp;Biden&nbsp;is then expected to travel to Helsinki for a&nbsp;meeting with Nordic leaders.
(Reporting by Michael Holden and Steve HollandAdditional reporting by Muvija M and Paul SandleEditing by Helen Popper and Leslie Adler)

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Biden arrives in Britain to meet King Charles, PM Sunak