Q5: Aren’t sanctions an alternative to war?

Diplomacy is the alternative to war. If additional U.S. sanctions now would cause the diplomatic process to break down, then war—or an Iranian nuclear weapon—would become more, not less, likely. There is neither international support nor a legal basis for going to war over the issue of uranium enrichment. If Israel wanted to end diplomacy and go to war over enrichment, then Iran would call that bluff and take the hit, knowing that an Israeli strike would unravel the sanctions regime. In those circumstances Iran probably also would expel international inspectors.