Don't Go Baghdad on Tehran
"Just as they did with Saddam Hussein, concerned governments have implemented economic sanctions, diplomatic isolation, and low-level violence to weaken the Iranian regime and prevent it from acquiring nuclear weapons, with the long-term objective of regime change. In Iraq, and seemingly now in Iran, diplomacy and inspections became a means to an end: building up a casus belli. The strategy failed miserably in Iraq a decade ago. It probably will in Iran, too..."
This is not to suggest that Iran poses no threat. Tehran has reached the threshold of having a nuclear weapons capability. In August, an International Atomic Energy Agency (IAEA) report stated that the country has 2,100 centrifuges in an underground site and has intensified production of nuclear fuel. To curb the Iranian nuclear program, concerned states have applied increasingly severe economic sanctions on the Iranian central bank and its crude oil sector, carried out cyber attacks on Iranian centrifuges, and attempted targeted assassinations of Iranian scientists and engineers. Meanwhile, in Jerusalem and Washington, decision-makers appear to be aligning their time frames for a preventive attack [http://nyti.ms/QphdvD]. At the United Nations in early October, Israeli Prime Minister Benjamin Netanyahu argued for instituting a redline on Iran's nuclear proliferation: Should Iran enrich uranium beyond a certain point, he urged, the world would agree to attack. European diplomats characterized his speech as reminiscent of former U.S. Secretary of State Colin Powell's to the United Nations in 2003, albeit with lower-quality graphics. But calling for war while intensifying pressure on Iran, without also clearly defining steps Tehran could take to defuse the tension, removes any incentives for Iran to change its behavior. In the short term, the hostility of Western nations is likely to make it more difficult for Iranian moderates to rein in the nuclear program. And in the longer term, Tehran will increasingly question whether Iran ought to remain within the Nuclear Nonproliferation Treaty in the face of economic sanctions, violence, and isolation. Without eyes on the ground, moreover, it will grow ever more difficult to assess Tehran's actual progress toward the nuclear weapons threshold. The world could miss the emergence of an Iranian breakout capability, or else blunder into another unjustified war.
Beyond the sheer challenge of trying to attempt regime change in Iran on a military and logistic level, there is the very real possibility that whatever regime taks the place of the one the U.S. topples will continue the nuclear weapons program for the very same reasons the current one is.