President Donald Trump said negotiations with Iran will begin Monday afternoon, after he decided to call off military strikes against the Islamic republic to pursue a deal. Speaking to reporters Sunday aboard Air Force One, Trump said Iran knew the extent of the attack that was being prepared and did not want to be attacked. He said the two sides are now talking in the form of a negotiation, but gave no details on the venue or participants. Tehran, meanwhile, continues talks with Oman over the Strait of Hormuz. The decision to hold off on strikes was welcomed by markets, with South Korea's Kospi index soaring 18% on Friday, its biggest single-day jump on record, signaling investors were back in buying mode.