U.S. President Donald Trump said here Tuesday that anyone doing business with Iran will not be allowed to maintain business ties with the United States.
Trump tweeted that "the Iran sanctions have officially been cast. These are the most biting sanctions ever imposed, and in November they ratchet up to yet another level."
"Anyone doing business with Iran will NOT be doing business with the United States," he warned.
The remarks came as the first batch of the re-imposed U.S. sanctions on Iran came into full effect on Tuesday.
These U.S. actions target Tehran's purchase of U.S. banknotes, trade in gold and other precious metals, as well as the use of graphite, aluminum, steel, coal, and software used in industrial processes.
They would also affect transactions related to the Iranian Rial, the issuance of sovereign debts, and the country's automotive sector.
Another round of sanctions, to be reinstalled on Nov. 5, will be on Iran's port, energy, shipping and ship-building sectors, its petroleum-related transactions, and business deals by foreign financial institutions with the Central Bank of Iran.