The Sudanese government has suspended its participation in the global hunger-monitoring system on the eve of a report that’s expected to show famine spreading across the country, a step likely to undercut efforts to address one of the world’s largest hunger crises.

In a letter dated Dec. 23, the government’s agriculture minister said the government is halting its participation in the Integrated Food Security Phase Classification (IPC) system. The letter accused the IPC of "issuing unreliable reports that undermine Sudan's sovereignty and dignity.”

On Tuesday, the IPC is expected to publish a report finding that famine has spread to five areas in Sudan and could expand to 10 by May, according to a briefing document seen by Reuters. "This marks an unprecedented deepening and widening of the food and nutrition crisis, driven by the devastating conflict and poor humanitarian access,” the document stated.