Its landmark nuclear agreement with the U.S. implemented, Iran is now moving to block American imports.

The order appears to come from the top, backed by Iranian Supreme Leader Ayatollah Ali Khamenei.

"Be watchful about irregular imports after lifting sanctions and seriously avoid importing consumer goods from the United States," Khamenei said in a published statement.

"We will implement the blockade on imports of American goods," Minister of Industry, Mine and Trade Mohammad Reza Nematzadeh said, International Business Tribune reports.

Per the nuclear agreement, international sanctions against the Islamic Republic we be lifted, and Iran is quickly preparing to open up petroleum sales to foreign buyers, the Financial Times reports.