Iran has officially stopped adhering to some of its commitments under the 2015 Joint Comprehensive Plan of Action (JCPOA), commonly known as the Iran nuclear deal. The terms of the deal allow Iran to produce low-enriched uranium with a 300-kg limit and heavy water with a stock capped around 130 tonnes. Having stepped back from that part of the deal, Iran will no longer have any limit for the production of enriched uranium and heavy water. Iranian Supreme Leader Ayatollah Ali Khamenei has said said that Tehran does not plan to negotiate another nuclear deal with the United States. Each country has said it is not seeking war with the other. Last Sunday, the White House also released a statement announcing that the United States is deploying the USS Abraham Lincoln aircraft carrier strike group to the Persian Gulf “to send a clear and unmistakable message to the Iranian regime that any attack on United States interests or on those of our allies will be met with unrelenting force.” To provide analysis, we are joined by Joseph Cirincione, president of the Ploughshares Fund, which aims to prevent the spread of nuclear weapons.