conduct annual military exercises with the US in September 2018, and would also stop its own drills in the Yellow Sea, in order to not provoke North Korea and to continue a peaceful dialog. On 1 July 2018 South and North Korea resumed ship-to-ship radio communication, which could prevent accidental clashes between South and North Korean military vessels around the Northern Limit Line (NLL) in the West (Yellow) Sea. On 17 July 2018, South and North Korea fully restored their military communication line on the western part of the peninsula. Cultural exchanges were also an important aspect of normalizing relations. In preparation for the 2018 Winter Olympics, held in South Korea, North Korean leader Kim Jong-un proposed sending a delegation of athletes and officials. In the opening ceremonies, North and South Korea marched together under the Korean Unification Flag. At the games the two countries fielded a united women's ice hockey team. Apart from their athletic delegation, North Korea sent an unprecedented high-level political delegation. This delegation was headed by Kim Yo-jong, sister of Kim Jong-un, and President Kim Yong-nam, and included musical performers like the Samjiyon Orchestra. The arrival of Kim Yo-jong to the games marked the first time since the Korean War that a member of the Kim ruling dynasty entered South Korean territory. The delegation extended President Moon an invitation to visit North Korea. On 1 April 2018, South Korean K-pop stars performed a concert in Pyongyang entitled "Spring is Coming", which was attended by Kim Jong-un and his wife. In May 2018, North Korea adjusted its time zone to match the South's while the South began removing propaganda loudspeakers from the border area in line with the Panmunjom Declaration. In recognition of President Moon Jae-in's attempts to restart engagement with North Korea and cooperate with Washington, Moon's return to the Sunshine Policy is sometimes referred to as "Moonshine Policy". While Moon is commended for his attempts at seeking peace for the peninsula, increased military hostility from South Korea and the United States has soured inter-Korean relations since 2019. Denuclearization of North Korea has also made little progress since 2019, while weapons testing has increased. See also Korean reunification North Korea–South Korea relations Korean Peninsula Energy Development Organization Hyundai Asan Nordpolitik Liberalism in South Korea Progressive Party (South Korea, 1956) References Further reading Kang, David C, "They Think They're Normal: Enduring Questions and New Research on North