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pakistan - population 180,000,000 - genie already out of the bottle as far as nukes are concerned - far too big a country to take on - too big a regional player to put offside (see genie)

iran - population 70,000,000, smaller country, not nuclear-armed (yet) so no need to fear the genie.

you do the maths... if "we" can't successfully invade iraq - a desert state - then what form is action against pakistan supposed to take?