In a historic first for a sitting U.S. president, Donald Trump crossed through the Demilitarized Zone and set foot in North Korea Sunday, walking side by side with North Korean leader Kim Jong-un after Kim greeted him at the demarcation line. Trump and Kim agreed to resume denuclearization talks, although Trump said sanctions on North Korea would remain for now. North Korea has said in previous negotiations that sanctions relief is a necessary precondition to any sort of deal. The symbolic move came 24 hours after Trump wrote a message on Twitter offering to meet Kim at the DMZ after the G20 summit wrapped up in Japan, and four months after nuclear talks between the two leaders broke down in February. We’ll have more on this story after headlines.