Press TV reports.
Sources close to the Iranian delegation told Press TV that the meeting was held between Undersecretary of Iran's Supreme National Security Council (SNSC) Ali Baqeri and Russia's Deputy Foreign Minister Sergei Ryabkov on Tuesday.
The meeting came before the representatives of the 5+1 group (the five permanent members of the UN Security Council and Germany) and the Iranian negotiating team launched a new session of their negotiations on Tuesday.
Iran and the P5+1 started the third round of their new series of talks in Moscow on Monday.
The Iranian negotiating delegation is led by Secretary of Iran's Supreme National Security Council (SNSC) Saeed Jalili, and the P5+1 group is headed by EU foreign policy chief Catherine Ashton.
Jalili earlier urged the West to respect Tehran's nuclear rights in order for the Moscow meeting to succeed.
He also expressed Iran's readiness to cooperate and enter talks with "different countries on a variety of issues, including collaborations in the field of nuclear energy."
The two-day Moscow negotiations are slated to follow up on the previous talks in Iraq and Turkey.
Iranian and Russian negotiators at the ongoing round of talks between the P5+1 and Iran in Moscow have met and exchanged viewpoints over Tehran’s nuclear energy program,