US warns nations engaging with Iran to cease activities quickly or risk facing sanctions.

US warns nations engaging with Iran to cease activities quickly or risk facing sanctions.

U.S. imposes harsh sanctions on Iran, warning supporters of potential repercussions as Iran vows to resist and retaliate.

U.S. launches 'Operation Economic Outcast,' targeting Iran's oil, shipping, and financial networks with sweeping new sanctions. Iran vows retaliation.