US President Donald Trump will find it difficult, if it is not impossible, to force Iran to renegotiate its nuclear deal with the six world powers, despite indications that Iran continues to defy its international obligations.
Tehran's provocative test of another ballistic missile last week prompted the Trump government to impose new economic sanctions against Iran.
It has also strengthened its hardline stance against Iran for key members of the new Government, including Mr. Trump.
Overnight Trump Twit, "Iran, First in Terror", and questioned how to sign the 2015 agreement.
But even the White House recognizes that the latest missile tests do not strictly violate the nuclear convention. Analysts said the deal would overtake the US.
"This is a multilateral agreement and it is not a bilateral agreement," said Dr Roger Shanahan of the Lowy Institute in Australia.
"He can try to renegotiate it, but it will require all the negotiating partners to agree that I can not see this happening.
"So, I do not think the JCPOA (Joint Integrated Action Plan) really do too much.
"There may be some changes on the brink of making a stricter censorship, but I do not think it will be affected.
However, Mr. Trump's words at least show that the United States turned to a tougher tone to Iran, which could mean future trouble.
"I think President Trump sees at least the rhetoric they will take against Iran in the near future," Dr. Shanahan said.
He cited the new US Defense Secretary James Matisse and national security adviser Michael Flynn's position that they have recently accused Iran of "state-sponsored terrorism."
"Iran's militant and lawless behavior has only increased since the Obama administration agreed to a comprehensive Iranian joint action plan in 2015," Flynn said in a statement announcing the sanctions.
"The international community is too tolerant of Iran's bad behavior.
"The days of Iran turning a blind eye to hostile and belligerent action against the United States and the international community are over.
Iran thanked this new "
The latest targets are 25 Iranian companies and individuals that support Iran's ballistic missile program, as well as the Al-Quds forces of the Iranian elite Revolutionary Guards.
But Dr. Shanahan said the United States could do more to limit Iran's military targets.
Ballistic missiles were fired and tested in Iranian distant and undisclosed locations.
Photo: According to the nuclear agreement, Iran is urged but has no obligation to avoid launching missiles. (Reuters: Mahmood Hosseini, Archives)
"I think in the short term, we may just see a little gesture," he said.
"You will see an exaggerated rhetoric that lets Iran know that these days there is a different view in Washington.
"They have to define exactly what they want to achieve, just that rolling back the Iranian influence in the region is almost an impossible goal because it has an impact in a number of ways, just as the other countries in the region exert influence same.
"I do not think we'll see too much in the short term.
"We must also understand that in May this year, the presidential election in Iran, any strengthening of the language from Washington may help the conservative Iranian politics.
Iran's top leader, Ayatollah Hamani, has laughed at Trump since taking office.
"We are grateful to this newcomer," he said in a speech to military leaders in Tehran.
"He has proven what we have been saying for more than 30 years and we have always talked about the political, economic, moral and social corruption of the US government, which was revealed during the campaign.
"His action has now demonstrated the reality of the United States and the significance of human rights in the United States.
