U.S. officials say Iran recently tested its supercaptivating Hoot torpedo, capable of traveling 250 miles per hour by evaporating the water around it.
Iran's defense minister said the test did not breach the Islamic Republic's nuclear agreement with world powers or a U.N. Security Council resolution endorsing the pact.
Under Iran's settlement with the United States, France, Germany, Britain, Russia and China, Tehran agreed to shrink its nuclear program to satisfy the powers that it could not be put to developing atomic bombs.
Iran has 'nothing else to discuss' and won't revisit the accord even under the threat of sanctions.
The announcement marked Tehran's first concrete reaction to a decision by Congress in November to extend some sanctions on Iran.
President Hassan Rouhani was speaking live on state television Tuesday.
Many fear the consequences if the president-elect follows through on calls to end the agreement.
If the deal is so good, why is the Obama administration keeping so many secrets?
The confidential report by the International Atomic Energy Agency (IAEA) did not point to any violations in Tehran's observance of the deal.
A report from a think tank, the Institute for Science and International Security, says yes.
Shahram Amiri disappeared in 2009, surfaced in the U.S. but returned home to Iran in 2010.
Non-nuclear sanctions continue to cripple Tehran's economy and the country's leaders have had enough.
British businessmen also blacklisted for supporting Iranian airline.
Prime Minister Benjamin Netanyahu seeks "immediate punitive steps" by world powers.
Iran is expecting an economic boom in the post-sanctions era.
Make no mistake: We negotiated with terrorists, and the terrorists won.
The Washington Post reporter was one of five Americans freed in a prisoner exchange.