The man who first warned the international community of the impending genocide in Rwanda is now fighting to ensure it never happens again.
Romeo Dallaire was the UN's Commander in Rwanda twenty years ago. His warnings were ignored and 800,000 people were slaughtered when Hutus slaughtered their Tutsi rivals.
A lot has changed at the UN since the Rwandan genocide. Soldiers can be deployed more quickly and member states have accepted that the international community has a responsibility to protect people from mass atrocities when their own government will not.
But as violence in South Sudan, the Central African Republic and Syria shows, the UN can not do much without the political will of member states.
Al Jazeera's Kristen Saloomey reports from the UN's headquarters in New York.