A warm glow following the Vienna agreement – under which Iran accepted curbs on its nuclear program in return for an easing of sanctions that have crippled its economy – is fading, Reuters reported.
Khamenei, the highest authority in Iran, told supporters on Saturday that U.S. policies in the region were “180 degrees” opposed to Tehran’s, in a speech punctuated by chants of “Death to America” and “Death to Israel”.
The government that negotiated the deal also talked tough on Wednesday in an apparent attempt to blunt attacks from opponents, including the Republican Guards.

Abbas Araqchi, a deputy foreign minister underlined Tehran’s message that the deal will not change its anti-Western foreign policy.
Araqchi, Iran’s senior nuclear negotiator, also told a news conference that any attempt to re-impose sanctions after they expired in 10 years would breach the deal.
He was referring to a resolution endorsing the deal passed by the United Nations Security Council on Monday. This allows all U.N. sanctions to be re-imposed if Iran violates the agreement in the next 10 years.
However, the world powers told U.N. Secretary-General Ban Ki-moon earlier this month that after 10 years they planned to seek a five-year extension of the mechanism allowing sanctions to be re-imposed.
Tehran’s support for regional allies, including Syrian President Bashar al-Assad, Houthi rebels in Yemen and the Lebanese Shi’ite militia Hezbollah, has alarmed Saudi Arabia, the leading Sunni power in the Middle East.
But US Defense Secretary Ash Carter said before his trip to meet Saudi King Salman that he aimed to discuss American strategy on countering “Iranian aggression” in the region, as well as the fight against the Islamic State jihadist group.
So far Riyadh’s response to the nuclear deal has been lukewarm public praise, coupled with private condemnation. Prince Bandar bin Sultan, a former head of the kingdom’s intelligence services, cautioned last week that it would allow Iran to “wreak havoc in the region”.