The Treasury said the purchases violated United Nations restrictions on materials that can be used for nuclear programs. "We're confident", the official said.
Analysts said Iran's gesture could provide an opening for Trump's administration to pursue diplomacy.
Beijing urged the USA on Friday to "correct" sanctions imposed on Chinese companies accused of helping Iran acquire materials for its nuclear program, AP reports.
If the foreign minister has suggested that the Majlis (the Iranian Parliament) would ratify the Additional Protocol now, that is a serious step. Iran won a lifting of global sanctions in return.
Iran has enriched its uranium past 3.67% (the previous limit) and has now exceeded the 4.5% mark.
Washington is trying to force Tehran to agree to stricter limits on its nuclear capacity, curb its ballistic missile program and end support for proxy forces in a regional power struggle with US -backed Gulf Arab states.
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Liverpool lost just one Premier League game last season, earning 97 points but falling short of a first league title since 1990. Indeed, Klopp himself has spent over three-and-a-half years building to this point, after Brendan Rodgers tried before him.
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The showrunner for Netflix's take on The Witcher , Lauren Hissirch, has revealed new details about the upcoming "very adult" show. There's a ton more in the Entertainment Weekly interview, particularly about the casting of Geralt and Ciri.
Geng said Beijing opposes nuclear proliferation but rejects Washington's unilateral sanctions.
He cites the example of Iran's seizure in early 2016 of two U.S. Navy patrol boats with 10 crew members in Iranian coastal waters - a situation that under other circumstances could have easily led to a risky standoff or worse. But he said it signaled Iran wants a diplomatic solution and suggested Iran has no intent to throw out IAEA inspectors.
The Islamic Republic denied the report and on Friday Iranian state television aired what said was footage disproving that the U.S. Navy had destroyed the drone over the Strait of Hormuz, through which tankers take Gulf oil to world markets. Shortly after, several media reported, citing a source in the US Defense ministry, that the United States suspected Iran of seizing the Riah, which is affiliated to a UAE port and was being detained in Iran's territorial waters near the IRGC base.
"Soon, images captured by the Guards' drones from the U.S. warship Boxer will be published to expose to world public opinion as lies and groundless the claim. of shooting down an Iranian drone over the Strait of Hormuz", the Revolutionary Guards said in a statement carried by news agencies.
"Treasury is taking action to shut down an Iranian nuclear procurement network that leverages Chinese- and Belgium-based front companies to acquire critical nuclear materials and benefit the regime's malign ambitions", Treasury Secretary Steven Mnuchin said in a statement.