美国制裁伊朗的沙姆哈尼石油贸易网络，美国称，伊朗新制裁是自2018年以来最严厉的。

Core Viewpoint - The United States has imposed sanctions on Iran's Shamkhani oil trade network, marking the most severe sanctions since 2018 [1] Group 1 - The new sanctions target Iran's oil trade, indicating a significant escalation in U.S. efforts to curb Iran's oil exports [1] - The U.S. government describes these sanctions as the toughest measures taken against Iran in the last five years [1]