(L-R) Serbia's Prime Minister Ana Brnabic, Britain's Prime Minister Theresa May and German Chancellor Angela Merkel walk in the gardens of St James's Palace during a reception in central London following the Western Balkans summit on July 10, 2018. (Photo by Chris J RATCLIFFE / various sources / AFP) (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
(L-R) German Chancellor Angela Merkel, Serbia's Prime Minister Ana Brnabic and Britain's Prime Minister Theresa May walk in the gardens of St James's Palace during a reception in central London following the Western Balkans summit on July 10, 2018. (Photo by Chris J RATCLIFFE / various sources / AFP) (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
(L-R) Poland's Prime Minister Mateusz Morawiecki, German Chancellor Angela Merkel, Serbia's Prime Minister Ana Brnabic and Britain's Prime Minister Theresa May walk in the gardens of St James's Palace during a reception in central London following the Western Balkans summit on July 10, 2018. (Photo by Chris J RATCLIFFE / various sources / AFP) (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
