to Trump, in which Kim expressed his hope for successful implementation of the US-North Korea Joint Statement and reaffirmed his will for improving the relations between the countries. Pompeo announced on August 23, 2018, that he would return to North Korea the following week for the fourth round of talks. The following day, Trump tweeted that he had asked Pompeo not to make the trip because he felt "we are not making sufficient progress with respect to the denuclearization of the Korean Peninsula". South Korean Foreign Minister Kang Kyung-wha urged continued U.S.-North Korean talks. In August, Foreign Minister Kang said that she had "considerable" consultations over a declaration of a formal end of the Korean War with the Chinese and U.S. foreign ministers. Chinese Foreign Minister Wang Yi expressed support for a declaration. North Korean Foreign Minister Ri Yong Ho said he was "alarmed" by U.S. insistence on maintaining sanctions until North Korea denuclearizes and what he said was U.S. reluctance to declare an end to the Korean War. According to Vox, Trump had made a spoken agreement with North Korea to sign a declaration ending the Korean War, both at a White House meeting on June 1, and during the Singapore Summit. However, National Security Adviser John Bolton and Defense Secretary Jim Mattis both opposed signing the declaration before denuclearization. Return of remains of US soldiers On July 27 North Korea handed over 55 boxes of human remains, thus starting to fulfill their pledge in the Singapore declaration. The remains were saluted in a ceremony in their honor by US soldiers. More than 36,000 American troops died during the Korean War, but some 7,700 remain unaccounted for, including 5,300 believed to have died in North Korea. The remains of 220 soldiers were recovered from North Korea during the years 1996–2005. North Korea reported to the U.S. Defense POW/MIA Accounting Agency that they could not be sure how many individuals were represented in each of the 55 boxes. After the failure of the Hanoi Summit, the US suspended the program. By October 2019, it was reported that 35–40 servicemen had been identified. Dismantling of rocket launch sites On July 24, North Korea began to dismantle a rocket launch site at Tonchang, an action which Kim had pledged to Trump. South Korean President Moon called the move "a good sign for North Korea's denuclearization". At the same time, the Sohae Satellite