The United States has pledged a landmark $2 billion to UN-managed humanitarian funds, a contribution UN officials say will expand lifesaving aid worldwide while reinforcing reforms aimed at faster, more accountable humanitarian action.

Global crisis: 300 million in urgent need of aid. UN's Martin Griffiths highlights failures in Gaza and Sudan.

Sudan's crisis deepens as UN warnings are ignored, pushing millions closer to famine and despair.

Gaza in turmoil: Relentless bombardments, rising casualties, and dire humanitarian crisis. Urgent international intervention needed.