Seoul stocks shot up by more than 2 percent Tuesday, extending their winning streak to a fourth day on optimism over a US-Iran deal to end the conflict and reopen the Strait of Hormuz. The local currency weakened against the US dollar. The benchmark Korea Composite Stock Price Index added 180.62 points, or 2.11 percent, to close at 8,726.6. Overnight, US stocks rallied after US President Donald Trump said a preliminary agreement to end the conflict with Iran had already been signed and the Strai