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.

CAIRO — Famine is spreading in Sudan due to a war between the military and a notorious paramilitary group that has devastated the country and created the world’s largest displacement crisis, a global hunger monitoring group said Tuesday.