President Donald Trump's apparent willingness to exit an agreement with Iran could undermine any hope of negotiations with another adversary: North Korea. The credibility of Washington's international commitments is now at stake, and mixed messages coming out of the White House are only exacerbating the situation.

Tehran, October 14, 2017: An Iranian man reads a copy of the daily newspaper 'Omid Javan' bearing a picture of U.S. President Donald Trump with a headline that reads 'Crazy Trump and logical JCPOA' (Joint Comprehensive Plan of Action) STR/AFP/Getty Images