图片来源：Majid Asgaripour / Reuters
In short then, Iran is very big and not very important, which means it would both be very expensive to do anything truly permanent about the Iranian regime and at the same time it would be impossible to sell that expense to the American people as being required or justified or necessary. So successive American presidents responded accordingly: they tried to keep a ‘lid’ on Iran at the lowest possible cost. The eventual triumph of this approach was the flawed but useful JCPOA (the ‘Iran deal’) in which Iran in exchange for sanctions relief swore off the pursuit of nuclear weapons (with inspections to verify), nuclear proliferation representing the main serious threat Iran could pose. So long as Iran remained non-nuclear, it could be contained and the threat to American interests, while not zero, could be kept minimal.，推荐阅读搜狗输入法获取更多信息
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