The parties met in a first round of talks in Oman's capital Muscat a week ago, which both parties described as constructive.
Araghchi said in connection with his visit to Moscow on Friday that Iran believes it is possible to reach an agreement on the country's nuclear energy program with the US as long as Washington is realistic.
In the balance lies, among other things, the lifting of sanctions against Iran, if the country scales back its ambitions to acquire nuclear weapons.
Critical Point
In an interview with the French Le Monde on Wednesday, Rafael Grossi, head of the UN's atomic energy agency IAEA, warned that Iran would soon be able to have access to a domestically produced nuclear weapon. Grossi, who met high-ranking representatives of Iran in Tehran this week, says that the talks are "at a critical point" and that "there is not much time left" to secure an agreement.
US President Donald Trump, who withdrew from the nuclear agreement JCPOA during his first term, has described military action against Iran as an absolute possibility if the talks do not go in the direction the US wants.
Israel has also threatened military action against Iran and stated on Friday that there is "a clear strategy of actions" to prevent Iran from acquiring nuclear weapons.
"Red Line"
Analysts say that the US may also bring up Iran's ballistic missile program as well as the country's support for militant Islamists in the Middle East in the talks on a nuclear energy agreement.
But Iran's Revolutionary Guard announced earlier this week that all issues related to defense capabilities will be kept out of the talks. The country's regional influence is also a "red line", according to the state news agency Irna.
Araghchi said a few days ago that Iran is not willing to negotiate on the country's uranium enrichment either.
