After Secretary Pompeo underscored humanitarian exemptions to U.S. sanctions on Iran, Foreign Minister Zarif hit back in a tweet arguing that the U.S. "blames Iran for unlawful U.S. sanctions preventing Iranians' access to financial services for food and medicine. Naturally, we will provide them for our people in spite of U.S. efforts. But U.S. is accountable for crimes against humanity re Iran and Yemen".