US President Donald Trump announced a 25 percent tariff on any country doing business with Iran, escalating pressure as nationwide protests continue in the Islamic republic, warning that the new trade penalties would immediately apply to Iran’s trading partners that also have business ties with the United States, a move that could impact key partners including China, Turkiye, the UAE and Iraq, while unrest fueled by economic grievances enters its third week despite internet blackouts and forceful crackdowns, posing one of the biggest challenges to Iran’s leadership since the 1979 Islamic Revolution.