Moscow warned Washington on Tuesday of "severe repercussions" on the relations between the two superpowers should Russian companies operating in Iran be affected by the new American sanctions imposed on the Islamic Republic.
"We assume that (Russian) companies which do violate the restrictions imposed by the UN Security Council (on Iran) will not be affected by the anti-Iranian American laws," the Russian Foreign Ministry said.
About a week ago the US Senate unanimously approved on Monday a package of new economic Iran's oil sector.
The West suspects Iran is working to build a nuclear bomb and the sanctions are meant to strip Tehran of revenue by shutting down financial deals with Iran's powerful state oil and tanker enterprises. Iran has said its nuclear program is for civilian purposes.