At current market rates, the imports are worth about $15bn.
The reimposition of US sanctions followed Trump's decision earlier this year to pull out of a 2015 deal to lift the punitive measures in return for curbs on Iran's nuclear program created to prevent it from building an atomic bomb.
"The performance of the US government over the years is such that today the United States is recognized as an unreliable country in the world that does not adhere to any of its obligations", the President said, calling for the "expansion of relations and cooperation" between Tehran and Pyongyang.
Iran's foreign minister Javad Zarif turned the tables on Washington's efforts to isolate the regime, saying Monday that it is in fact the US, Israel, and Saudi Arabia who are isolated in their hostility towards Iran.
On Tuesday, US President Donald Trump wrote on social media that "anyone doing business with Iran will NOT be doing business with the United States".
The US is now also pushing Pyongyang to scrap its nuclear capabilities after Trump and North Korea's leader Kim Jong Un agreed a vague commitment to "denuclearisation of the Korean Peninsula" at their landmark summit in June.
The surprise meeting comes as US-Iran relations are further strained amid the first wave of the US reinstated sanctions coming into force.
Iran's utmost authority Supreme Leader Ayatollah Ali Khamenei said the Islamic Republic had nothing to be concerned about, a report on his official website said on Wednesday, as the country's clerical leadership faces biting US sanctions.
Trump has said he is ready to hold talks with Iranian leaders, without preconditions but meanwhile, his administration has vowed to press on with its pressure campaign.
"Our policy is based on a clear-eyed assessment of the Iranian dictatorship, its sponsorship of terrorism, and its continuing aggression in the Middle East and all around the world", the president said.
'We stand together to stop Iran's malign activities'.
Already facing broad economic fallout as their currency implodes, Iranians are wondering how the next phase of the crisis in U.S. relations will play out - and what, exactly, America's long-term strategy is toward their country.
"For whatever reason they're doing that, I hope that continues", Votel said.
Oman hosted secret talks between the two countries in 2012 that ultimately led to the 2015 landmark nuclear deal with world powers.
Long-running discontent over high prices, unemployment, water shortages and the lack of political reform has sparked numerous protests over the past week, though verifiable information is scarce due to heavy reporting restrictions.
The US ambassador to Germany, Richard Grenell, welcomed the news.