VIENNA - Iran's nuclear envoy said on Friday it would be a "strategic mistake" to build atom bombs, dismissing what a leading Western expert cited as evidence suggesting Tehran was seeking the means to do just that.Ali Asghar Soltanieh, Iran's ambassador to the International Atomic Energy Agency (IAEA), also insisted during a public debate that sanctions and the Stuxnet computer virus had failed to slow the Islamic Republic's disputed nuclear program.