The leaders of North and South Korea are meeting in the North Korean capital for talks centred on the stalled denuclearisation negotiations.
North Korea has embarked on an unprecedented series of meetings this year with both the South and the US.
But talks with Washington have reached deadlock, with both sides so far agreeing only to very general goals.
South Korea's President hopes to be a mediator between the two, as well as boosting the inter-Korean relationship.
President Moon Jae-in and his wife Kim Jung-sook arrived in Pyongyang on Tuesday morning for the three-day visit.
They were warmly welcomed from the plane by Kim and his wife, Ri Sol-ju.
Tens of thousands of North Koreans waved flowers and shouted unification slogans as the leaders rode in an open car through parts of Pyongyang.
It's the first trip to the North Korean capital by a leader from the South in a decade.
It is Moon's third meeting with the North's Kim Jong-un since their historic summit at the border in April this year.
The Korean War ended in 1953 with an armistice – but no formal peace treaty was signed.
What's on the agenda?
The two leaders are expected to talk about what practical steps to take to reduce the nuclear threat on the Korean peninsula, but the specifics are not known.
For South Korea, there are two main goals:
- to further inter-Korean co-operation and rapprochement
- to act as a negotiator between Pyongyang and Washington on the issue of denuclearisation.