So, This Is A Question I've Had

And I'm glad to see an article where it's being discussed. What happens if the Republicans get their way and the negotiations with Iran are quashed? Are other countries around the world going to honor our sanctions?

First, it is highly unlikely that even our allies in Europe would join us in further sanctions against Iran in the wake of a nuclear agreement they believe is sensible and positive. That is even truer for other countries—like India, Japan, South Korea and China—that were pulled into the existing sanctions regime quite unwillingly. The support of these countries for the oil sanctions in particular has been critical to the sanctions’ effectiveness. They will not willingly sign up for more.

Second, if a deal falls through, it is likely that the existing multilateral sanctions regime will begin to crumble. As noted, countries like India and South Korea, who don’t feel threatened by an Iran nuclear weapon, will be only too happy to find a pretext to break out of the sanctions—perhaps tentatively at first but in a rush as others do. It will be hard to argue the rationale for sanctions, which, from the perspective of nearly every nation, will have achieved their purpose—bringing Iran to the table to negotiate serious limitations on its nuclear program.

And do we want to deny producers in this country the opportunity to trade in a major market?

And .courtesy of Charles Pierce, I find that the pope is on board with the Munich Agreement 2015:

Pope Francis wants to give peace with Iran a chance. 

Delivering his Easter message from St. Peter's Basilica at the Vatican Sunday, the pope gave his backing to the nuclear deal reached between Iran, the United States, China, Russia, France, the United  Kingdom and Germany.