The coronavirus pandemic has worsened a “grim” economic outlook for the world’s poorest countries, UN trade officials believe, with many likely to be “mired” in crises for years to come. An “emerging two-speed global recovery” from the pandemic and related restrictions, which last year caused most countries’ economies to shrink, could “reverse many hard-won development gains,” the United Nations Conference on Trade and Development (Unctad) warned on Monday.