league of nations
although its break up was a sign of impending war (now that we look back), WW2 had more to do with not dealing with Germany's aggression after WW1. Nations stood to the side as Germany build up its aggression barely a decade later (sounding familiar yet). And I seem to remember France not doing much of anything then either.
I find it unique and unfortunate that so many want to blame the US for its actions in Iraq 12 years ago and today when France played just as much of a role in this whole mess. France thought containment would work, and yet here we are 12 years later (much like the Jews in Europe during WW2) wondering why we didn't do more eariler.
Eventually we will only be able to say "we were too late."