Iran, of course, will simply ignore any and all sanctions.
They can, they have, and they will. War with Iran is problematic as hell. Yet more sanctions, however, would be a disaster for the West, a good joke for the Islamic Republic. Israel cannot take them down all by our lonesome. The US is unreliable, the EU even less so. Arab and Islamic states who feel threatened will cut us off at the knees whenever it serves their momentary interests. Russia, I think, is in Iran’s corner. China? Dunno. India, maybe will make a good ally. Welcome to WW III.