The U.S. push for Iran to adhere to the Joint Comprehensive Plan of Action (JCPOA) terms has drawn some international incredulity given how the United States withdrew from agreement in May 2018 while noisily alleging many JCPOA flaws. More subtly, the Trump administration has begun to lay the groundwork for what can be described as its first real redline for the nuclear program: that any reduction in Iran’s one-year breakout timeline, the amount of time Iran would need to produce enough enriched uranium for a bomb, is unacceptable. It is unclear how much reduction the administration would tolerate, what its response would be, and given President Donald Trump’s avowed preference for a deal and to avoid another conflict in the Middle East, whether it would be enforced at all. Yet, National Security Advisor John Bolton in late May linked any Iranian expansion of enrichment activities to a deliberate attempt to shorten the breakout time to produce nuclear weapons, which would suggest that a severe response, perhaps even military force, would be on the table to prevent Iran from a nuclear restart. At the very least, the United States is shifting the traditional definition of what is unacceptable from a weapon or having the ability to produce one quickly to any deviation from JCPOA baseline restrictions. Read the full article by Eric Brewer and Richard Nephew on Arms Control Today.