The Organisation of Islamic Cooperation (OIC) has made Muslim solidarity central to how it presents itself. Nine years ago, Myanmar’s military massacred Rohingya civilians and drove hundreds of thousands from their homes. The persecution has not ended: the Rohingya remain stateless, face continuing violence and risk death while fleeing by sea. Throughout those years, the OIC has held summits and passed resolutions. Yet it has failed to protect them.

When I founded the Burma Human Rights Network 14 years ago, I believed that if we gathered evidence carefully and put it before institutions with the power to act, they would act. We have gathered testimony from survivors of massacres. We have documented the systematic destruction of Rohingya villages, the denial of their citizenship and the deliberate starvation of a people. Yet despite all this documentation, the situation facing the Rohingya has mostly grown worse. The International Court of Justice is expected to rule later this year on whether Myanmar’s actions constituted genocide.

I have sometimes asked myself whether a ruling could help stop the atrocities. The Rohingya survivors who gave evidence in The Hague relived the........

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