0206 GMT September 26, 2018
"The US is regularly violating the nuclear deal and this is a source of concern for Iran. Therefore, we will raise this issue in Vienna," Iranian Ambassador to Britain Hamid Baeidinejad said in an interview with Kyodo News in London.
On March 16, deputy foreign ministers of Iran and the P5+1 group – Russia, China, Germany, France, Britain and the United States – will meet in the Austrian capital to review the implementation of the Iran nuclear deal and address concerns.
Iran believes that Washington is scaring European traders about the consequences of working with Iranian companies and it is necessary for the European Union to resolve the matter for the sake of the deal.
Since Trump entered the White House in January 2017, he has repeatedly criticized the deal, known as the Joint Comprehensive Plan of Action (JCPOA), calling it the "worst deal ever negotiated." He has also threatened to exit the deal.
Earlier this year, Trump said he will refuse to waive sanctions against Iran in May if his administration cannot reach an agreement with Europe.
Iran and the European Union have differences over some crucial issues including the former's ballistic missile program. Iran insists its missile program is defensive.
"All we have agreed is that the nuclear deal has no link to other issues," Baeidinejad said.
A day before the Vienna gathering, European powers will meet with American officials in Berlin.
"The agenda of the Berlin meeting is not to prepare for another negotiation over Iran's missile or regional issues. We have been assured that Britain's position in the Berlin meeting will be to convince the US to keep adhering to the deal," he said.
"Britain has declared to us that they will have a very frank dialogue with the US and they will expect the Trump administration to adhere to its commitment to nuclear deal," he added.