The U.N. is appealing to the U.S., Iran and other involved parties to “lower the rhetoric and lower the threshold of action” as tensions flare between the two nations. Iran’s Foreign Minister Mohammad Javad Zarif responded to what he called “genocidal taunts” from President Trump, warning him not to threaten the country after Trump tweeted on Sunday, “If Iran wants to fight, that will be the official end of Iran. Never threaten the United States again!” Iran has repeatedly said it does not want a war with the U.S. Zarif responded that “Iranians have stood tall for millennia while aggressors all gone… Try respect–it works!”

Iranian state media reported Monday the country had quadrupled its production of low-enriched uranium but that it would still remain within the limit set by the 2015 nuclear deal. Tehran and other signatories to the deal are seeking to keep the landmark agreement alive after the U.S. withdrawal last year.