Iran's foreign minister has held Washington responsible for the breakdown of talks, after arriving in Russia as part of a rapid diplomatic tour, with direct negotiations between the conflicting parties appearing to have stalled.

Foreign Minister Abbas Araghchi made the remarks in Saint Petersburg, where he is expected to meet with Russian President Vladimir Putin, having sandwiched a trip to Oman in between visits to the main mediator, Pakistan, over the past few days, The Caspian Post reports, citing foreign media.

Islamabad played host to the first and only round of unsuccessful talks between Washington and Tehran, and Araghchi's visit had fanned hopes for fresh negotiations over the weekend, until US President Donald Trump scrapped a planned trip by his envoys Steve Witkoff and Jared Kushner.

"The US approaches caused the previous round of negotiations, despite progress, to fail to reach its goals because of the excessive demands," Araghchi said Monday.

After calling off his emissaries' trip, Trump told Fox News that if Iran wanted talks, "they can come to us, or they can call us", though he has said the cancellation does not signal a return to hostilities.

In a sign that backchannel efforts were ongoing, the Fars news agency said Iran had passed "written messages" to the Americans via Pakistan spelling out red lines, including nuclear issues and the Strait of Hormuz.

Fars news agency said the messages were not part of formal negotiations, however.

US media outlet Axios, citing a US official and two other sources with knowledge of the matter, reported on Sunday that Iran had sent a new proposal to end the war centred on reopening the Strait of Hormuz and ending a US naval blockade there, with nuclear negotiations postponed for a later stage.

Iranian state news agency IRNA cited the report without denying it.

Global Issue

The subject of the strait was on the agenda during Araghchi's trip to Oman, which lies on the other side of the waterway from Iran.

"The safe passage through the Strait of Hormuz is an important global issue. Naturally, as the two coastal countries of this strait, we must speak with each other so that our common interests are secured," Araghchi said from Saint Petersburg.

Russian and Iranian state media confirmed Araghchi would speak with Putin, citing officials from their respective governments.

Iran's Revolutionary Guard, however, have said have no intention of lifting their market-shaking blockade, saying control of the Hormuz "and maintaining the shadow of its deterrent effects over America is the definitive strategy" of Tehran.