Iranian President Ebrahim Raisi said on Saturday that Tehran was serious in its nuclear talks with world powers in Vienna, as its top negotiator said important disagreements remained, state media reported.
Indirect US-Iranian talks to revive a 2015 Iran nuclear deal are taking place in the Austrian capital.
Diplomats from France, Britain, Germany, Russia and China shuttle between the two sides because Tehran refuses direct contact with Washington.
A European source, speaking on condition of anonymity, suggested on Friday that Iran had agreed to continue talks from where they left off in June. Iranian officials denied this.
Under the original deal that then-US President Donald Trump abandoned in 2018, Iran limited its nuclear programme in return for relief from US, European Union and UN sanctions.
"The fact that we presented the text of Iran's proposal to the negotiating parties shows that we are serious in the talks, and if the other side is also serious about the removal of (US) sanctions, we will achieve a good agreement," state news agency IRNA quoted Mr Raisi as saying.
But Iran's top negotiator said on Saturday that several issues remained unresolved in the Vienna talks.
"Several points of difference have remained which require decision-making at the high-level and these are still on the table unresolved," Ali Bagheri Kani told state-run Press TV.
A year after Trump's reimposition of sanctions on Iran, Tehran began to gradually violate nuclear limits of the agreement. Iran wants all sanctions to be lifted.
Bagheri Kani told Reuters on Friday that Tehran was standing firm on the position it laid out last week.
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Coffee: black death or elixir of life?
It is among the greatest health debates of our time; splashed across newspapers with contradicting headlines - is coffee good for you or not?
Depending on what you read, it is either a cancer-causing, sleep-depriving, stomach ulcer-inducing black death or the secret to long life, cutting the chance of stroke, diabetes and cancer.
The latest research - a study of 8,412 people across the UK who each underwent an MRI heart scan - is intended to put to bed (caffeine allowing) conflicting reports of the pros and cons of consumption.
The study, funded by the British Heart Foundation, contradicted previous findings that it stiffens arteries, putting pressure on the heart and increasing the likelihood of a heart attack or stroke, leading to warnings to cut down.
Numerous studies have recognised the benefits of coffee in cutting oral and esophageal cancer, the risk of a stroke and cirrhosis of the liver.
The benefits are often linked to biologically active compounds including caffeine, flavonoids, lignans, and other polyphenols, which benefit the body. These and othetr coffee compounds regulate genes involved in DNA repair, have anti-inflammatory properties and are associated with lower risk of insulin resistance, which is linked to type-2 diabetes.
But as doctors warn, too much of anything is inadvisable. The British Heart Foundation found the heaviest coffee drinkers in the study were most likely to be men who smoked and drank alcohol regularly.
Excessive amounts of coffee also unsettle the stomach causing or contributing to stomach ulcers. It also stains the teeth over time, hampers absorption of minerals and vitamins like zinc and iron.
It also raises blood pressure, which is largely problematic for people with existing conditions.
So the heaviest drinkers of the black stuff - some in the study had up to 25 cups per day - may want to rein it in.
Rory Reynolds
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