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Colombian President Juan Manuel Santos (2R) is introduced to British Prime Minister Theresa May (2L) by Britain's Queen Elizabeth II (R) during a ceremonial welcome at the start of the Colombian president's three-day state visit to the UK at Horse Guards Parade in central London on November 1, 2016. Colombian President Juan Manuel Santos, who won this year's Nobel Peace Prize for his efforts to implement a peace deal with FARC rebels, begins a state visit to Britain that includes a trip to once conflict-ridden Northern Ireland. / AFP / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Colombian President Juan Manuel Santos (2R) is introduced to British Prime Minister Theresa May (2L) by Britain's Queen Elizabeth II (R) during a ceremonial welcome at the start of the Colombian president's three-day state visit to the UK at Horse Guards Parade in central London on November 1, 2016. 
Colombian President Juan Manuel Santos, who won this year's Nobel Peace Prize for his efforts to implement a peace deal with FARC rebels, begins a state visit to Britain that includes a trip to once conflict-ridden Northern Ireland. / AFP / DANIEL LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)