Gholamali Khoshroo argues in a commentary published by the Guardian on Wednesday that by abrogating a multilateral 2015 nuclear deal and imposing new sanctions on foreign companies doing business with Iran, the Trump administration is also reneging on UNSC resolution 2231.
Rouhani hinted last month that Iran could block the Strait of Hormuz, a major oil shipping route, if the USA attempted to stop the Islamic Republic's oil exports.
"China's lawful rights should be protected".
Mr Zarif added the idea of halting the exports of Iran's most valuable goods "simplistic and impossible" and will lead to "consequences".
The top US general in the Middle East on Wednesday said the military remains "extraordinarily vigilant" about Iranian movements in the Persian Gulf following last week's Iranian naval exercise in and around the Strait of Hormuz.
Washington is rolling out unilateral sanctions on Iran in stages following Trump's decision to withdraw the USA from the 2015 Iran nuclear deal.
Danish engineering company Haldor Topsoe, one of the world's leading industrial catalyst producers, said on Wednesday it would cut around 200 jobs from its workforce of 2,700 due to the new U.S sanctions on Iran, which made it very hard for its customers there to finance new projects.
He has said the deal "failed to achieve the fundamental objective of blocking all paths to an Iranian nuclear bomb" and did not address Tehran's "malign activities, including its ballistic missile programme and its support for terrorism". At current market rates, the imports are worth some $15 billion a year. Turkey buys an estimated 9.5bn cubic metres of gas from Iran.
However, the EU blocking statute is thought unlikely to do much to stem the outflow of European investment from Iran driven by firms anxious about losing access to U.S. money markets.
Russia, which remains a signatory of the 2015 deal along with the European Union and others, also slammed the USA sanctions on Iran.
Trump's National Security Adviser John Bolton told Fox News that the United States policy "is not regime change, but we definitely want to put maximum pressure on the government".
Iranian President Hassan Rouhani said in a meeting with North Korean Foreign Minister Ri Yong Ho on Wednesday that the U.S.is an "unreliable" country and can not be trusted.
The chief executive of reinsurance group Munich Re said it may abandon its Iran business under pressure from the United States, but described the operation as very small.