London/Nairobi/Washington, April 13 -- Vice President JD Vance landed in Islamabad on Saturday tasked with ending six weeks of war and overcoming 47 years of enmity - 21 hours later, he flew home without a deal. The two sides left Pakistan with no resolution to thorny issues like Iran's nuclear program or its control of the Strait of Hormuz. It was always unlikely that they'd reach a breakthrough in a single day even after their highest level meeting in nearly half a century. But by early Sunday morning, it was clear they weren't much closer to resolving a war that's killed thousands and roiled global energy markets. "We leave here with a very simple proposal - a method of understanding that is our final and best offer," Vance said at a sho...