Japanese Emperor Naruhito and Empress Masako arrive at a hotel in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive at a hotel in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive at a hotel in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Officials bow their head for the vehicle carrying Japanese Emperor Naruhito and Empress Masako in London on Sept. 17, 2022. The royal couple will attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive at a hotel in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito and Empress Masako arrive at a hotel in London to attend the state funeral for Queen Elizabeth II on Sept.17, 2022. Queen Elizabeth II, seven decades, the longest-serving British monarch has died at 96 at Balmoral Castle, her estate in the Scottish Highlands. The State Funeral of Her Majesty Queen Elizabeth II will be held at Westminster Abbey on September 19th, and approximately 500 dignitaries from around the world will attend the demise of Her Majesty Queen Elizabeth II, the national mourning funeral. ( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's prince Aiko sees off Emperor Naruhito and Empress Masako at the Imperial palace in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's prince Aiko sees off Emperor Naruhito and Empress Masako at the Imperial palace in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's Emperor Naruhito and Empress Masako leave Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's　Crown Prince Akishino and Princess Kiko see off Emperor Naruhito and Empress Masako at Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's　Crown Prince Akishino and Princess Kiko see off Emperor Naruhito and Empress Masako at Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's　Crown Prince Akishino and Princess Kiko see off Emperor Naruhito and Empress Masako at Haneda Airport in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's princess Aiko sees off Emperor Naruhito and Empress Masako at the Imperial palace in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japan's princess Aiko sees off Emperor Naruhito and Empress Masako at the Imperial palace in Tokyo on September 17, 2022. The Emperor and Empress will attend Queen Elizabeth II's state funeral on 19th. It is highly unusual for a Japanese emperor to attend a funeral in a foreign country, and this will be the current Emperor's first trip abroad since his enthronement.( The Yomiuri Shimbun via AP Images )

Japanese Emperor Naruhito (L) and Empress Masako depart for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (Front L) and Empress Masako (R) arrive at Haneda airport before their departure for London to attend the state funeral of Britain Queen Elizabeth II, in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (top-R) and Empress Masako depart for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (L) and Empress Masako bow to well wishers before their departure for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (C) and Empress Masako (2nd L) greet Crown Prince Akishino (R) and Crown Princess Kiko (2nd R) before their departure for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (R) and Empress Masako (L) greet British Ambassador to Japan Julia Longbottom (C) before their departure for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (L) and Empress Masako greet well wishers before their departure for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)

Japanese Emperor Naruhito (C) and Empress Masako (2nd L) greet Crown Prince Akishino (R) and Crown Princess Kiko (2nd R) before their departure for London to attend the state funeral of Britain Queen Elizabeth II, at Haneda airport in Tokyo on September 17, 2022. (Photo by Kazuhiro NOGI / AFP)