Why U.S.-Iran tensions could quickly escalate into a crisis
Zarif and the current Secretary of State, Mike Pompeo, have never spoken directly, according to Iran's mission at the United Nations. They instead tend to communicate through name-calling on Twitter.
Iranians burn a U.S. flag during a protest against President Donald Trump's decision to walk out of a 2015 nuclear deal, in Tehran, Iran, May 11, 2018. (photo credit: REUTERS)ByREUTERS