Explainer: In new talks, U.S. and North Korea to face old disagreements

U.S. President Donald Trump shakes hands with North Korean leader Kim Jong Un as they meet at the demilitarized zone (DMZ) separating the two Koreas, in Panmunjom, South Korea, June 30, 2019. KCNA via REUTERS

SEOUL (Reuters) - When nuclear talks resume after Sunday's off-the-cuff meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un at the inter-Korean border, negotiators will be revisiting old disagreements that have scuttled previous talks.

Trump and Kim agreed to set up teams to hold working-level talks, which have stalled since a second summit in February in Vietnamese capital Hanoi failed to agree on U.S. calls for denuclearisation and North Korean demands for sanctions relief.