FNA- Iranian Supreme Leader's top aide Ali Akbar Velayati underlined that his country has no concerns about the US president's words and threats, noting that Donald Trump's possible aggression against Tehran will lead to a heavy defeat for Washington.

"We are not at all concerned about Trump's remarks because despite his superficial claims, the situation is not appropriate for him to do what he wants," Velayati said on Sunday.

Stressing that Trump is wise enough not to engage in a war against a country (Iran) whose people and government are standing like an iron dam to defend themselves, he said, "If he wants to test his chances (in this regard), an unprecedented defeat will be marked in the US history."

His comments came after Iran's Supreme Leader Ayatollah Seyed Ali Khamenei in sarcastic remarks to the US president thanked Donald Trump for showing the true face of his country to the world, and meantime told him that Iranians are too powerful to be intimidated by his threats.

"We are not thankful of that (Obama's) administration at all because it imposed heavy sanctions (against Tehran) with the aim of crippling the Iranian nation and the Islamic Republic and of course, it didn’t attain its goal as no other enemy will be able to cripple this great nation either," Ayatollah Khamenei said in Tehran last Tuesday, addressing the Army's Air Force and Air Defense commanders and personnel.

"Why should we thank the former US administration? For the anti-Iran sanctions? For the creation of the ISIL? For setting fire on Syria and Iraq? Or for their hypocrisy, that is they express sincerity and tendency for cooperation in a private letter but show clear support for sedition (unrests) after the 2009 (presidential) election?" he added in reaction to Trump's comments that Tehran should thank the Obama administration.

"These are instances of the same velvet glove worn by the former US administration over its iron clad," Ayatollah Khamenei said.

He also blasted Trump's recent remarks that the Iranians should fear him, and said, "Iranians don’t fear threats."

Ayatolllah Khamenei, meantime, thanked Trump for showing Washington's real face to the world, and said he proved the correctness of Iran's warnings about the political, economic, social and moral corruption in the US ruling system.