Q3: Wouldn’t additional sanctions serve as an insurance policy to protect against a bad deal or an impasse in the negotiations?

Good insurance policies do not undermine what they are supposed to insure, as added sanctions at this point would do with the negotiations. It would be a mistake to write off, in effect, a process that already has come very close to a preliminary agreement.

What would this “insurance” buy? One always has to ask what the alternative to a negotiated agreement is. Endless sanctions and a lack of an agreement buy us nothing in the way of restrictions on the Iranian nuclear program.