Americans framed former head of the IMF Dominique Strauss Kahn – who was a favourite for the upcoming presidential election in France in 2011. He was a critic of US economic policy, harmful for France as well. As president of France, he might have been inconvenient for the Americans. It was a political assassination of a man, who had all chances of becoming the President of France. Therefore in 2012 François Hollande, who was considered useful for the Americans, was put into the presidential chair in France.
Conspiracy theory with no evidence. Consistent with pro-Kremlin disinformation narratives about American domination in Europe and lack of democracy in France. For examples see: French Maidan is a lesson for those who refuse to obey American diktat; France is not a liberal democracy.
More on Dominique Strauss-Kahn: CNN.