Indirect talks between Tehran and Washington aimed at breaking an impasse about how to salvage Iran’s 2015 nuclear pact have concluded without progress, the United States State Department has said.

Iran had “raised issues wholly unrelated to the JCPOA [the 2015 nuclear deal] and apparently is not ready to make a fundamental decision on whether it wants to revive the deal or bury it”, the US State Department said on Wednesday evening, after two days of European Union-mediated discussion in the Qatari capital Doha.

“Indirect discussions in Doha have concluded, and while we are very grateful to the EU for its efforts, we are disappointed that Iran has, yet again, failed to respond positively to the EU’s initiative and therefore that no progress was made,” a US State Department statement said.

Earlier on Wednesday, the EU’s envoy Enrique Mora tweeted that the talks did not make the progress that “the EU team as coordinator had hoped-for”.

“We will keep working with even greater urgency to bring back on track a key deal for non-proliferation and regional stability,” Mora said.

The talks started on Tuesday with Mora as the coordinator, shuttling between Iran’s chief negotiator Ali Bagheri Kani and Washington’s special Iran envoy Rob Malley.

Mora’s comments came hours after the semi-official Iranian Tasnim news agency described the negotiations as having “no effect on breaking the deadlock in the talks”.

“What prevented these negotiations from coming to fruition is the US insistence on its proposed draft text in Vienna that excludes any guarantee for Iran’s economic benefits,” Tasnim said, citing informed sources at the talks.

Iran’s foreign ministry spokesman Nasser Kanani issued a statement on Wednesday describing the two-day talks as “being held in a professional and serious atmosphere”.

The US Department of State did not immediately comment.

In 2018, then-US President Donald Trump ditched the 2015 nuclear pact and reimposed crippling sanctions on Iran’s economy.

A year later, Tehran reacted by gradually breaching the nuclear limits of the deal.

Across 11 months of talks between Tehran and major powers to revive their nuclear deal stalled in March, chiefly over Tehran’s insistence that Washington remove the Islamic Revolutionary Guards Corps, its elite security force, from the US Foreign Terrorist Organisations List.