Iran has announced sanctions on 15 US companies, including Raytheon and RE/MAX, apparently in response to sanctions the Trump administration unveiled last month following an Iranian missile test.

Per AP: "The wide-ranging list... appeared more symbolic than anything else as the firms weren't immediately known to be doing business anywhere in the Islamic Republic."

The context: The Trump administration has taken a combative tone with Iran, with former National Security Adviser Michael Flynn putting the county "on notice" following the ballistic missile test.