Seoul stocks rose sharply on Monday with the KOSPI closing at 8,545.98, up 422.36 points or 5.2 percent, following a statement by U.S. President Donald Trump that an agreement had been reached with Iran to end hostilities and lift the naval blockade in the Strait of Hormuz. The Korea Exchange issued a sidecar trading measure, the 14th such instance, amid foreign and institutional buying. A signing ceremony is scheduled in Switzerland on Friday.