The Obama administration promised to show a friendly hand with Iran at the time of taking over one and a half years back, but today it is also doing exactly what the earlier US administrations were doing.
Despite special efforts by the Obama administration, the Iranian regime is continuing to pursue dangerous nuclear operations in a clandestine manner, and it is already costing the US and NATO forces heavily in Iraq / Afghanistan / Pakistan.
So the US government has today signed up another round of special sanctions against Iran and forbids access to US markets for any company doing business with Iran.
Whether this would be helping in bringing Iran to the negotiation table is a billion dollars question.