- Trump said the US would begin blocking ships entering or leaving Iran's ports at 10 a.m. ET on April 13.

- The spokesperson for the Unified Command of the Iranian Armed Forces said on Monday that US restrictions on vessels in international waters are "illegal and constitute piracy," adding that Iran would decisively implement a permanent mechanism to control the Strait of Hormuz following US threats.

- After peace talks between the United States and Iran concluded in Islamabad without an agreement, regional mediators are racing to secure a second round of negotiations within days to prevent the collapse of a fragile two-week ceasefire, the Wall Street Journal reported on Sunday, citing officials familiar with the matter.