NAIROBI, Kenya (AP) — The head of the World Health Organization has described the persistent crisis in Ethiopia’s Tigray region as “the worst disaster on Earth” and asked if the reason global leaders haven’t responded is due to “the color of the skin” of the people who live there. In an emotional statement on Wednesday, WHO Director-General Tedros Adhanom Ghebreyesus said the Ukraine conflict has the global community potentially “sleepwalking into a nuclear war,” but he argued the situation in his home country is far worse. The conflict in Ethiopia began in November 2020, and little humanitarian aid has arrived since Tigray forces retook much of the region. Tigray’s 6 million people are essentially cut off from the world.