The Security Council has today said that in the 21st century, the world will not tolerate genocide or crimes against humanity.

There is very little to celebrate in the latest U.N. summit outcome document. We wanted a bold agenda to tackle poverty but instead we have a brochure showcasing past commitments.

We've taken the step of exposing the governments blocking the agreement so people around the world can call on them to change their minds.

This commitment is as clear as it is historic. Today we congratulate world leaders on agreeing their responsibility to protect civilians. After each genocide in the past, world leaders have said 'never again'; now, at last, the world has agreed that 'never again' should mean 'never again', and this could help make tragedies like the Rwandan genocide a thing of the past.

Less than 48 hours from the beginning of the summit there remains real risk that major agreements will be blocked by a small number of countries that seem determined to block the summit's success. These include Pakistan, Egypt, Iran, Syria, Venezuela and Cuba.

The international community must never again allow genocide or mass murder to go unchecked. This is a moral issue of huge importance and will establish a new standard that could help save millions of lives.