President Mahmoud Ahmadinejad on Thursday warned European countries not to follow the US lead in imposing unilateral sanctions against his country, state radio reported. Ahmadinejad threatened unspecified retaliation by Iran if Europe followed in the footsteps of the United States, which last week announced sanctions against the Islamic state. “If they plan to cooperate with the enemy of the Iranian nation, we cannot interpret this as a friendly behaviour. We will show reaction,” the radio quoted Ahmadinejad as saying. “You, Europeans, know well what will happen in the economic sphere if Iran takes a serious move in this matter,” the Iranian leader said. IRNA, the state official news agency, also quoted Ahmdinejad as saying: “You, Europe, need us more” - a veiled reference to business ties between Tehran and European nations.