In the opulent halls of the Emirates Palace hotel, a seat of power in Abu Dhabi where 114 domes decorate the vast rooftop, a delegation of about a dozen Chinese diplomats lobbied foreign ministers of the Muslim world last month.

China has been fighting criticism that it has detained as many as one million members of Muslim ethnic minorities in indoctrination camps in its western Xinjiang region. But at the two-day conclave in early March, the Organization of Islamic Cooperation — a group of 57 nations that has been a vocal defender of the Rohingyas and Palestinians — handed Beijing a significant victory.

In a resolution on protecting the rights of Muslim minorities around the world, the group praised China for “providing care to its Muslim citizens.”

Its vast system of detention without trial has drawn condemnation from the State Department and Congress, but no sanctions, and only scattered criticism in Europe and at the United Nations. That is still more of a response than in the Muslim world, where nations — including Pakistan, Indonesia and other recipients of big Chinese loans — have overlooked China’s abuses against ethnic Uighurs, Kazakhs and others.