President Donald Trump arrives in Paris on Thursday for a meeting with France's President Emmanuel Macron, a day ahead of the country's Bastille Day celebrations.

This year, American troops will join their French allies in the annual parade, to mark 100 years since the US intervened in World War One.

It is not every president who can resist a military parade, especially one with a bit of revolutionary fervour thrown in.

Both presidents see themselves as unconstrained by the old style of established politics, both are keen to portray themselves as strong leaders, and there are real political differences too.

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