Talks to strike a deal to scale down Iran’s contested nuclear program are reportedly at a decisive moment, ahead the June 30 deadline. But should Iran eventually develop a nuclear bomb, what are the implications? Could a nuclear Iran spark a nuclear arms race in the Middle East? Also in this edition of Between the Lines, Australia has relied on its close alliance with the United States.  But is that security relationship still in Australia’s best interests? Or should Australia refocus its foreign policy attention on China?