Empress Masako gestures as she speaks to dignitaries as she and Emperor Naruhito arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
The plane carrying Emperor Naruhito and Empress Masako arrives at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
The Japanese flag flies form the cockpit window of the plane carring Emperor Naruhito and Empress Masako as it arrives at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito is saluted by a member of the honour guard as he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Japanese Emperor Naruhito, center left, and Empress Masako, center right, smile as they depart for the state visit to Britain, at Haneda airport in Tokyo, Japan, Saturday, June 22, 2024. Japanese Crown Prince Akishino is seen at left, while Crown Princess Kiko is at second left. (Kyodo News via AP)
Japanese Emperor Naruhito, left, and Empress Masako smile as they depart for the state visit to Britain, at Haneda airport in Tokyo, Japan, Saturday, June 22, 2024. (Kyodo News via AP)
Emperor Naruhito and Empress Masako are greeted by dignitaries as they arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito is saluted by a member of the honour guard as he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito is greeted by dignitaries has he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito and Empress Masako walk through a guard of honour after arriving at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Japan Empress Masako smiles as she disembarks at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (Chris Radurn/PA via AP)
Emperor Naruhito and Empress Masako smile at the media walk through a guard of honour after arriving at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)