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"This is a bad mistake of historic proportion." —Israeli Prime Minister Benjamin Netanyahu.
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"We are confident that the world has breathed a sigh of relief today." —Russian President Vladimir Putin.
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"Sanctioning Iran until it capitulates makes for a powerful talking point and a pretty good political speech but it is not achievable outside a world of fantasy" —Secretary of State John Kerry.
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"I am under no illusion that all of the problems relating to Iran will be resolved as a result of this agreement. Nor can it be ruled out that those opposed to a deal will now attempt to sabotage its implementation." —German Foreign Minister Frank-Walter Steinmeier.
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"There is a real opportunity for Iran to benefit from this agreement in terms of its economy but this will only happen if Iran delivers on all the agreed actions required to fully address international concerns about its program." —British Prime Minister David Cameron.