PYONGYANG North Korea released images of its uranium enrichment facility for the first time on Friday, showing leader Kim Jong Un touring it as he called for more centrifuges to boost his nuclear arsenal. The country, which conducted its first nuclear test in 2006 and is under rafts of U.N. sanctions for its banned weapons programmes, has never publicly disclosed details of its uranium enrichment facility. Such facilities produce highly enriched uranium — which is needed to produce nuclear