Velayati was apparently referring to Trump's decision in May to withdraw from Iran's 2015 nuclear agreement with world powers, a move that triggered the reinstatement of USA sanctions.
"Russian Federation is prepared to invest in Iran's oil sector", the adviser, Ali Akbar Velayati, told Iranian state television from Moscow.
Trump earlier said he planned to raise the topics of Syria, Ukraine, arms control, and allegations of Russian meddling in United States elections during the Monday talks.
Following news reports of the visit, Argentine Judge Rodolfo Canicoba Corral requested the arrest of Velayati, the Jerusalem Post said.
Iraq and Syria have been among the countries gripped by terrorism. "He said Russian Federation will stand by Iran and will defend Tehran's rights", Velayati said.
Rep. Gohmert's comments about Strzok's infidelity prompt charges of hypocrisy against GOP
The sharp tone of Strzok's statement set the stage for a contentious hearing following hours of closed-door questioning last week. But the report said it found no evidence of political bias in the FBI's decision to not pursue criminal charges against Clinton.
Earlier this month Israel's military said it had sent reinforcements to the Golan Heights, as Syrians fled the fighting set up makeshift camps near the Israeli-held plateau.
Russian Federation and Iran have provided critical military support to help the Assad government turn the tide of the war.
He added that if those two countries declare they do not need Iran's presence, the Islamic Republic will depart from there.
As fighting wanes after seven years of war, the US has made curtailing Iran's influence in post-war Syria a strategic objective - one strongly backed by Israel.
"Our opinion is known that Iran needs to leave Syria", Netanyahu said after that meeting.
"Qassemi said after Trump's "strategic mistake" to exit the multilateral and worldwide accord, Iran made a decision to dispatch a number of its special representatives" to other countries to "carry messages of high-ranking" Iranian officials about the country's viewpoints and stance on the "selfish" USA behavior which runs counter to worldwide regulations. The $750 million deal between Zarubezhneft and Iran's privately owned Dana Energy aims to raise production at the Aban and West Paydar fields, which now produce a combined 36,000 b/d. He suggested Iran will use avenues it has used in the past to evade the sanctions to receive payments for its oil exports.