Iran’s foreign minister warned the U.S. on Monday that it “cannot expect to stay safe” after launching what he described as an economic war against Tehran, taking a hard-line stance amid a visit by Germany’s top diplomat seeking to defuse tensions.

A stern-faced Mohammad Javad Zarif offered a series of threats over the ongoing tensions gripping the Persian Gulf. The crisis takes root in President Donald Trump’s decision over a year ago to withdraw America from Iran’s 2015 nuclear deal with world powers.