According to Khamenei, Iran will respond to "every wrong step by the United States regarding the nuclear deal".
Iran would react strongly to any "wrong move" by the United States on Tehran's nuclear deal, Supreme Leader Ayatollah Ali Khamenei said, after President Donald Trump accused Iran of violating the "spirit" of the agreement.
While Iranian officials made a decision to hold nuclear negotiations and even retreat from part of the country's rights to have the sanctions lifted, the U.S. is behaving in a cruel, bullying and forceful manner despite all of those negotiations, commitments, Imam Khamenei said.
Speaking at the graduation ceremony at the Iran's Police Academy, Khamenei said that the Iranian nation "stands firmly on its own feet" and is capable of responding to hostile actions of any state.
He also noted that the reason behind insecurity in the Middle East can be traced back to the "wicked and mischievous interventions" by the United States.
"The United States of America's regime is truly the most vicious of devils", Ayatollah Khamenei added.
His comments came after U.S. President Donald Trump said on Thursday that Iran was violating "the spirit" of the 2015 deal under which Tehran got sanctions relief in return for curbing its nuclear programme.
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Iran denies its missile development breaches the resolution, saying its missiles are not created to carry nuclear weapons.
"The opponents of the JCPOA are restricted to two or three countries, including some in the United States, who feel cheated".
On Saturday, Rouhani urged the European Union to press the United States to abide by its commitments to the nuclear deal reached in 2015, Tehran Times daily reported. "We would not have a problem with that", state news agency IRNA quoted Rouhani as saying.
"Iran also expects the European Union to send this strong message to the USA (administration)", Rouhani said during a meeting with the visiting president of the Chamber of Representatives of Belgium, Siegfried Baracke.
Washington extended some sanctions relief for Iran on Thursday under the nuclear deal with world powers but said it had yet to decide whether to maintain the agreement.
The worldwide agreement is facing a serious threat of collapse as tensions mounted between Washington and Tehran recently.