TEHRAN (FNA)- Iranian Foreign Ministry Spokesman Hossein Jaber Ansari underlined that despite endorsement of the nuclear agreement, no measurable change is witnessed in the relations between Tehran and Washington.

"No fundamental and principled change has been made in the strategic atmosphere dominating (the interactions between) Iran and the US and it is a fact that we in Iran and the Americans agree," Jaber Ansari told reporters in his weekly press conference in Tehran on Monday.

He blasted a secret budget bill approved by the US Congress to support the Iranian government's overthrow, and advised the Americans not to repeat the same old mistakes against Iran.

"Interaction with the Iranian nation and the Islamic Republic of Iran which is a government based on a big popular revolution and the great Iranian nation's power and choice is not possible but through mutual respect and accepting Iran's national sovereignty," Jaber Ansari said.

Iran and the world powers reached a final agreement in Vienna on July 14 to end a 13-year-old nuclear standoff.

In relevant remarks last month, Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei cautioned that despite the nuclear deal and Washington's claims, the US is still seeking to change the ruling system in Iran.

"The reality is that the US objectives vis a vis the Islamic Republic of Iran have not changed at all and if they can, they will not hesitate a moment to annihilate the Islamic Republic but they cannot, and with God's help, they will fail in materializing this goal in the future too in light of industrious moves by the youth, increasing and deepening insight of the nation and Iran's progress," Ayatollah Khamenei said in Tehran, addressing the Iranian university students and pupils on the threshold of the 'Students Day' and the 'Day of Campaign against Arrogance' in Iran.

He referred to certain superficial and unreal flexibilities shown by the US during the recent nuclear talks with Iran, and said that the reality behind such behavior is that the US is still pursuing the same inimical policies towards Iran, which will never be forgotten by the Iranian nation.

Ayatollah Khamenei underscored that the US support for the criminal Zionist regime and the Saudi-led coalition's crimes against the Yemeni people reveals Washington's real face.

He referred to Iran's normal relations with other world states even those who show some hypocritical behavior towards the Iranian nation, but said the US which uses every pretext to hit a blow at the nation and annihilate the Islamic Republic is an exception to this rule, reiterating that "religion, wisdom, conscience and humanity all stand against such friendship".

Ayatollah Khamenei pointed to the US continued practical enmity towards the Islamic Republic, and said religious beliefs are the root cause of this enmity as it is the source inspiring the Iranian nation with resistance. "Therefore, they have targeted those beliefs using new instruments but our students and youth will foil such tricks and plots."

By Fars News Agency