Two senior officials criticized the US for deliberately interfering with the implementation of the nuclear deal, which has failed so far to deliver the Iranians the promised dividends.
It was clinched with the six major powers (the five permanent members of the UN Security Council plus Germany) and has been in force as of January 16 to give Iran sanctions relief in return for temporary constraints on its nuclear program.
But Tehran has complained about the lingering non-nuclear US restrictions that have scared away international firms and banks, dealing a setback to hopes for a revival of the sanctions-hit Iranian economy by interacting with the world markets.
The lingering sanctions include a ban on processing the dollar-denominated transactions linked to Iran through the US financial system.
Also, the US Congress has sought to undermine Iran's prospects of economic recovery. US Republican lawmakers, along with some Democrats, have opposed the landmark agreement.
In its latest anti-deal moves, the House of Representatives approved three measures: one to impose fresh sanctions on Iran over alleged terrorism sponsorship and human rights violations, another to bar its access to the US financial system and the third to block the US administration from purchasing more heavy water from the Islamic Republic.
Tehran has asked the US to do more to ease international concerns about dealing with Iranians.
No Shift in West's Policy
"The [American] side has certain tools that it is using in various ways to stop the precise implementation of the Joint Comprehensive Plan of Action," Kamal Kharrazi, the head of Iran's Strategic Council on Foreign Relations, said, referring to the pact by its formal title.
Kharrazi, who formerly served as foreign minister, cautioned against holding a naive view that there has been a shift in the West's hostile policy on the Islamic Republic after the nuclear deal.
"This shows we are dealing with our [true] enemies. That we have managed to agree on the JCPOA does not mean that our differences with them have been resolved," Kharrazi said in an interview with Fars News Agency on Tuesday.
Iran has always denied its nuclear program has had military purposes, arguing that western powers have used such accusations as an excuse to impose "unfair" sanctions.
Russian President Vladimir Putin has recently called the allegations "mythical".
"A mythical Iranian nuclear threat, which was used as a justification for the construction of a ballistic missile defense, has become a thing of the past, but the facilities of missile defense structures are still being constructed in Eastern Europe," Putin said late last month.
Ali Akbar Velayati, a top advisor to the Leader of Islamic Revolution Ayatollah Seyyed Ali Khamenei, said Iran is capable of responding to what he called "the US lack of commitment" to the action plan.
"Although some members of P5+1 [the six powers] have come to realize that American [accusations] were a ploy, which is considered a success for us, we need to continue to draw international attention to make other members of P5+1 aware of US machinations and compel the Americans to respect their commitments," he said.
"As I have previously said our hands are not tied in making reciprocal moves," he was quoted as saying by IRNA after meeting National Security Advisor of Pakistan Nasir Khan Janjua in Tehran on Monday.
