Hardly any Iran expert believes that sanctions on Iran will force it to give up Uranium enrichment. Furthermore, the upcoming sanction on refined petroleum imports will not only fail but hurt Iranian reformists we claim to support. Proponents say that sanctions would show resolve and buy time for further negotiations, delaying the prospect of military action. This widely propagated thesis is deeply flawed. Tougher sanctions with no change in our negotiating position are far more likely to lead to war. Indeed, political scientists studying over 200 cases of the use of sanctions, found they increase the chance of subsequent military conflict six-fold. Why not explore options of limited enrichment but intrusive inspections -- these would be far more effective in preventing an Iranian nuclear weapon.
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from the article: U.S. Senate approves sanctions on Iran's fuel suppliers