•U.S. warns Yar’Adua advisers not to upset stability •Nigerians demand to see ailing president There was disquiet last night in Nigeria and around the world over the heavy deployment of armed troops who laid siege to Abuja and its environs as ailing president Umaru Yar’Adua sneaked into town in the dead of night and without fanfare, ending his more than three months absence from Nigeria. Troops were deployed from the brigade of guards without the formal knowledge of top defence chiefs...- full story