President Donald Trump has warned that countries doing business with Iran will “not be doing business with the United States” as his administration reimposed sanctions on Iran Tuesday.

Trump described the measures as “the most biting sanctions ever” and warned they would “ratchet up to yet another level” in November, when US sanctions on Iranian oil will be reimposed.

“I am asking for WORLD PEACE, nothing less!” Trump posted online.

Trump’s warning appeared to be aimed at the European Union, which is attempting to protect European businesses trading in Iran from facing US sanctions.

US sanctions are being unilaterally reimposed on Iran in waves following Trump’s decision to withdraw from the Iranian nuclear deal earlier this year.