UNITED NATIONS — Under intense pressure from the government of Sudan, the United Nations is planning to shrink its floundering peacekeeping force in Darfur, even though renewed fighting there has chased more people from their homes this year than during any other in the past decade.

The withdrawal plans come right after the chief prosecutor of the International Criminal Court, Fatou Bensouda, announced that she had decided to suspend the genocide case against Sudan’s president, Omar Hassan al-Bashir, because world powers have done nothing to secure his arrest.

The twin retrenchments are emblematic of the limits of international attention at a time when Darfur has been overshadowed by newer crises and conflicts around the world, from the civil wars in Syria and South Sudan to the Ebola epidemic.

Once the world’s largest peacekeeping operation, with 20,000 blue-helmeted soldiers on the ground, the United Nations force in Sudan’s Darfur region has already been trimmed by 4,000 troops, and plans are underway to cut more in the coming months despite the surge in violence.