1 b% V7 O" h3 K e" V2 lLONDON (Reuters) - Oil rose towards $70 on Wednesday as U.S. warships put on a show of force off Iran's coast, coinciding with a United Nations agency report that said the Islamic republic had expanded its nuclear programme. + i, J& f. P; w# R$ x& `- F r) N6 k' [4 v& ^$ m