Britain's Kate, Princess of Wales, left, speaks with Olena Zelenska, first lady of Ukraine, as she welcomes her to Buckingham Palace in London, Sunday Sept. 18, 2022, ahead of the funeral of Queen Elizabeth II. (Kirsty O'Connor/Pool via AP)

Britain's Catherine, Princess of Wales (L) speaks with First Lady of Ukraine, Olena Zelenska (L) during a meeting at Buckingham Palace on September 18, 2022. - Britain was gearing up Sunday for the momentous state funeral of Queen Elizabeth II as King Charles III prepared to host world leaders and as mourners queued for the final 24 hours left to view her coffin, lying in state in Westminster Hall at the Palace of Westminster. (Photo by Kirsty O'Connor / POOL / AFP)

Britain's Catherine, Princess of Wales (L) speaks with First Lady of Ukraine, Olena Zelenska (L) during a meeting at Buckingham Palace on September 18, 2022. - Britain was gearing up Sunday for the momentous state funeral of Queen Elizabeth II as King Charles III prepared to host world leaders and as mourners queued for the final 24 hours left to view her coffin, lying in state in Westminster Hall at the Palace of Westminster. (Photo by Kirsty O'Connor / POOL / AFP)