US President Donald Trump said the United States is negotiating with Iran at Iran's request, with support from Saudi Arabia, the United Arab Emirates, Qatar, and other countries, and warned that this is the last chance. Meanwhile, the United Kingdom Maritime Trade Operations reported that a cargo ship was struck by an unknown object off the coast of Oman. A senior adviser to Iran's supreme leader disclosed that Iran canceled a retaliatory strike plan against Ukraine after Ukraine apologized for an attack on an Iranian commercial vessel in the Caspian Sea. In addition, 25 US states with Democratic governors sued the Trump administration to challenge new import tariffs of up to 12.5 percent on goods from 60 trading partner countries and territories, arguing that the president lacks legal authority to impose such measures.