Excerpt:
Mark Dubowitz, an expert on sanctions at the Foundation for Defense of Democracies who has advised the Obama administration and met recently with European negotiators on the deal, said Russia's stance is "an early warning signal that fundamentally snapbacks may sound legally possible, but practically speaking they're going to be very difficult to implement."
The Russians are saying they're not going to give up their veto on the U.N. Security Council and surrender it to an automatic snapback, Dubowitz said. And after a deal is signed, it will be just as hard to get agreement from U.S. allies in Europe, especially after they start selling products to Iran and buying its oil, he added.
"Snapbacks are going to run into a wall of Russian and Chinese intransigence in the Security Council, and they're going to run into a wall of human greed in the marketplace," he said.