How should a country apologize for their past actions and how long?

When we live in a globalized society, we face a need to cooperate with different countries. Japan has tried to fix its relationship with Korea for a while, but the relationship seems to be getting worse. How can a country apologize for a past action and how long do the reparations take?
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This page was last edited on Tuesday, 1 Sep 2020 at 13:17 UTC