With international efforts to renew a 2015 nuclear deal having stalled, the Iranians have ramped up uranium enrichment, a process with civilian uses that can also eventually yield fuel for nuclear bombs - though they deny having any such design."In two or three years, you may be traversing the skies eastward and taking part in an attack on nuclear sites in Iran," Defence Minister Benny Gantz told graduating air force cadets in a speech.However, some experts doubt Israel has the military clout to deliver lasting damage to Iranian targets that are distant, dispersed and well-defended.Under an ambiguity policy designed to deter surrounding foes while avoiding provocations that can spur arms races, Israel neither confirms nor denies having nuclear weaponry.Unlike Iran, Israel is not a signatory to the voluntary Non-Proliferation Treaty of 1970, which offers access to civilian nuclear technologies in exchange for the forswearing of nuclear weaponry."