"The US companies were banned from activities in Iran in line with their own policies while many European and Asian countries are involved in Iran's sensitive projects," Iran's Deputy Oil Minister for International and Trade Affairs Hossein Noqrekar Shirazi told reporters.
"Therefore, from our viewpoint, there is no ban on the presence and activity of the US companies in Iran, and they themselves have, in fact, caused their deprivation," the official added.
Meantime, Noqrekar Shirazi underlined that Iran has not attended any talks or held any deals with the US oil firms.
Regarding European investors in Iran's energy sector, the official said that Iran is interacting with them to implement its current projects, warning that if the European companies avoid activity in the field, Iran would carry out its projects through using local companies.
The comment by the Iranian oil official came days after the US lawmakers passed a bill barring companies that sell fuel to Iran from winning deals with the US government in a bid to up the pressure on Tehran for its nuclear program.
The bill was included in the Department of Energy's proposed 2010 budget that passed by an 80-17 vote in the Senate.
The House of Representatives has already approved a similar measure. Both chambers must approve identical legislation before it can go to Obama to sign into law.
The measure states that no foreign company that sells more than one million dollars' worth of refined petroleum products to Iran can bid for Department of Energy contracts. Despite being a major oil producer, Iran imports 40 percent of its gasoline products.
Iran, which sits on the world's second largest reserves of both oil and gas, is facing US sanctions over its civilian nuclear program.
Iranian officials have dismissed US sanctions as inefficient, saying that they are finding Asian partners instead. Several Chinese and other Asian firms are negotiating or signing up to oil and gas deals.
Following US pressures on companies to stop business with Tehran, many western companies decided to do a balancing act. They tried to maintain their presence in Iran, which is rich in oil and gas, but not getting into big deals that could endanger their interests in the US.
Yet, after oil giants in the West witnessed that their absence in big deals has provided Chinese, Indian and Russian companies with excellent opportunities to sign up to an increasing number of energy projects and earn billions of dollars, they started showing increasing interest to invest or expand work in Iran.
Some European states have also recently voiced interest in investment in Iran's energy sector after the gas deal was signed between Iran and Switzerland regardless of US sanctions.
The National Iranian Gas Export Company and Switzerland's Elektrizitaetsgesellschaft Laufenburg signed a 25-year deal in March 2008 for the delivery of 5.5 billion cubic meters of gas per year.
The biggest recent deal, worth €100m ($147m, £80m), was signed by Steiner Prematechnik Gastec, the German engineering company, this year to build equipment for three gas conversion plants in Iran.
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