at this place", and "You are the first US President to cross the border". They briefly crossed the border into North Korea before crossing back into South Korea. After meeting at the border, Trump, Kim and Moon Jae-in entered the Inter-Korean House of Freedom for approximately one hour. A result of the brief meeting was that both U.S. and North Korea agreed to set up teams to resume denuclearization talks, which had previously stalled at the Hanoi Summit earlier in the year. The meeting has been reported as historic as it was the first time a sitting U.S. president has set foot in North Korea; former US Presidents Jimmy Carter and Bill Clinton had previously visited North Korea after they left office. Subsequent developments in 2019 During 2019, North Korea conducted a series of short–range missile tests, while the US and South Korea took part in joint military drills in August. On 16 August 2019, North Korea's ruling party made a statement criticizing the South for participating in the drills and for buying US military hardware, calling it a "grave provocation". On September 10, 2019, Trump tweeted that he had asked Bolton for his resignation which was given shortly thereafter. North Korea had previously called Bolton a "warmonger". Pro-North Korean newspaper Chosun Sinbo welcomed Bolton's resignation, stating that he was to blame for breaking off the February summit in Hanoi. Trump had disagreed with Bolton's advocacy of "Libyan model" for North Korea. Bolton subsequently repudiated Trump's policy, saying that North Korea was becoming more dangerous. On September 23, 2019, Trump and Moon met in New York, at the time of the 74th United Nations General Assembly session. Trump downplayed the seriousness of North Korea's short-range missiles, stating that they had not been covered by an agreement and describing them as "nothing spectacular". Both Trump and Moon expressed support for continuing negotiations. As agreed at the DMZ summit, talks began in Stockholm on 5 October 2019 between US and North Korean negotiating teams. After one day, the North Koreans said that talks had broken down, blaming US inflexibility. The US team, however, said discussions were good, and would be resumed. On December 7, 2019, a spokesman for North Korea's Defense Academy announced that an important test had been conducted at the Sohae Satellite Launching Station, but no details were forthcoming. In December 2019, US Ambassador to the United Nations Kelly Craft