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.
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.
Despite not saying which consequences the USA will face in his latest statement, Iran had previously warned it could block the Strait of Hormuz, widely used by the regional states to export their oil and gas, as a comeback against the sanctions.
His Tuesday morning tweet came as Washington's new sanctions on Tehran took effect overnight. "They can not think that Iran won't export oil and others will export.".
"China's commercial cooperation with Iran is open and transparent, reasonable, fair and lawful, not violating any United Nations Security Council resolutions", it added in a faxed statement to Reuters.
Ri is on a two-day visit to Tehran; he was due to meet with President Hassan Rouhani on Wednesday.
"China's lawful rights should be protected".
Zarif said in his Wednesday remarks that the world was taking Iran's side in the face of U.S. acts.
At current market rates, the imports are worth about $15bn.
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Mohammad Javad Zarif told the Iran newspaper that President Donald Trump's goal of forcing the rest of the world not to buy Iranian oil was impossible.
European countries, hoping to persuade Tehran to continue to respect the deal, have promised to try to lessen the blow of sanctions and to urge their firms not to pull out.
President Donald Trump on Tuesday warned that firms doing business with Iran would be blocked from the USA market as new sanctions hit the country despite appeals from Washington's allies.
Turkey, however, said it would continue to buy natural gas from Iran.
Despite the political will to hold firm, many large European firms such as German automaker Daimler are leaving Iran for fear of United States penalties.
Despite opposing claims from the United States and Israel, researchers from the International Atomic Energy Agency (IAEA) maintain that Iran continues to abide by its commitment in the deal.
"It symbolizes the determination to curb Iran's regional aggression and its ongoing plans to arm itself with nuclear weapons", said Netanyahu in a video released Monday, moments after Trump signed new sanctions into law.
Iran's Foreign Minister Mohammad Javad Zarif met with his North Korean counterpart Ri Yong Ho on Tuesday (Aug 7), on the same day the USA reimposed nuclear-related sanctions on the Islamic republic.
"They fear the application of overwhelming American power, and as long as the overwhelming power is credible, they will be cautious in how they'll escalate", he said. Anyone doing business with Iran will NOT be doing business with the United States.