Japan and South Korea have taken different tones and policy stances ahead of the upcoming summit between Donald Trump and Kim Jong-un. Japan has stressed a more hardline response that stresses complete denuclearization and disarmament without rewarding North Korea simply for coming to the negotiating table. South Korea, on the other hand, has emphasized a softer approach with a more optimistic outlook on future changes and the trustworthiness of the North Korean regime. 

Source: Japan and South Korea at odds over tactics for North Korea denuclearization