This is historic, since it's the first time that America has made these sorts of sanctions against the armed forces of another country.
I'd see this as good news, except that
- Sanctions don't have a very good track record, in terms of results.
- America doesn't trade very much with Iran anyway, thanks to the ayatollah's takeover a few decades back.
- European countries will, unless things have changed a great deal, go on with business-as-usual with Iran.