Tehran, Iran - Iran insisted it has not responded to a reported 15-point proposal from the US to end the unprovoked war launched by President Donald Trump and Israel.

"We receive messages from the American side, some direct and some through our friends in the region, and whenever necessary we respond to these messages," Foreign Minister Abbas Araghchi said in an interview with Al Jazeera aired on Wednesday and dubbed into Arabic from Persian.

"There are no grounds for negotiations," he said, adding however that some messages had been exchanged directly with US special envoy Steve Witkoff.

Diplomatic efforts involving Turkey, Egypt and Pakistan have recently been launched to try to end the devastating war. Last week, two senior Pakistani officials said Islamabad had conveyed to Iran a 15-point plan containing US proposals.

Iranian media had reported that Tehran offered a five-point counte-proposal calling for an end to what it described as "aggression" and for guarantees that neither the US nor Israel would resume hostilities.

But Araghchi said Tehran "has not offered anything in response" to the US plan and that reported Iranian responses were "merely guesses" from a media outlet.

Having been attacked twice by the US and Israel while in the middle of negotiations, Araghchi said there was "zero" trust and that Iran would not accept a ceasefire, instead calling for a "complete end to the war" and reparations.

Since the start of the conflict, now in its second month, Iran has allowed only a trickle of ships to pass through the strategic Strait of Hormuz, disrupting roughly 20% of global oil flows.

Iran says the strait is closed only to enemy shipping. Araghchi also laughed off Trump's repeated claims that the US was negotiating with dissenting factions of Iran's government, denying the existence of "different decision-making centers."