French President Francois Hollande (3rdL) stands with Britain's Prime Minister David Cameron (2ndL), as he listens to Prince William and his wife Catherine, the Duchess of Cambridge as they arrive to attend a ceremony at the Franco-British National Memorial in Thiepval near Albert, during the commemorations to mark the 100th anniversary of the start of the Battle of the Somme, northern France, July 1, 2016. REUTERS/Philippe Wojazer