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Britain's Queen Elizabeth II meets Milos Zeman (C), President of the Czech Republic, accompanied by his wife Ivana (L) and daughter Katerina (2nd L) during a private audience with Her Majesty at Buckingham Palace in central London on June 16, 2017. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Britain's Queen Elizabeth II meets Milos Zeman (C), President of the Czech Republic, accompanied by his wife Ivana (L) and daughter Katerina (2nd L) during a private audience with Her Majesty at Buckingham Palace in central London on June 16, 2017. / AFP PHOTO / POOL / John Stillwell        (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

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LONDON, ENGLAND - JUNE 16: Queen Elizabeth II meets Milos Zeman, President of the Czech Republic, accompanied by his wife Ivana and daughter Katerina during a private audience with Her Majesty at Buckingham Palace on June 16, 2017 in London, England. (Photo by John Stillwell - WPA Pool / Getty Images)

LONDON, ENGLAND - JUNE 16: Queen Elizabeth II meets Milos Zeman, President of the Czech Republic, accompanied by his wife Ivana and daughter Katerina during a private audience with Her Majesty at Buckingham Palace on June 16, 2017 in London, England. (Photo by John Stillwell - WPA Pool / Getty Images)

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LONDON, ENGLAND - JUNE 16: Queen Elizabeth II meets Milos Zeman, President of the Czech Republic, accompanied by his wife Ivana and daughter Katerina during a private audience with Her Majesty at Buckingham Palace on June 16, 2017 in London, England. (Photo by John Stillwell - WPA Pool / Getty Images)

LONDON, ENGLAND - JUNE 16: Queen Elizabeth II meets Milos Zeman, President of the Czech Republic, accompanied by his wife Ivana and daughter Katerina during a private audience with Her Majesty at Buckingham Palace on June 16, 2017 in London, England. (Photo by John Stillwell - WPA Pool / Getty Images)