An Iranian source told CNN on Tuesday that there had been “outreach” between the United States and Tehran and that Iran is willing to listen to “sustainable” proposals to end the war.

“There has been outreach between the United States and Iran, initiated by Washington, in recent days, but nothing that has reached the level of full-on negotiations,” the source said.

“Messages have been received through various intermediaries to scope out whether an agreement to end the war can be reached.”

“The proposals being looked at are aimed not merely at achieving a ceasefire, but a concrete agreement to end the conflict between the US and Iran,” they added without going into further detail.

The source refused to comment on US President Donald Trump‘s public statements on the negotiations, and emphasized Iran’s position has been always clear that Tehran is ready to consider any viable proposal.

“Iran is not asking for a meeting or direct talks with the United States but is willing to listen if a plan for a sustainable deal comes within reach that would preserve the national interests of the Islamic Republic of Iran,” the source said.

“Iran is ready to provide all the necessary guarantees that it will never develop nuclear weapons but is entitled to peaceful use of nuclear technology.” The source insisted that any proposal must also include ending all sanctions imposed on Iran.