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It may be good bargaining.
When a treaty favors Japan, when we attempt to renegotiate it, we are told
how Japanese culture insists that a treaty once signed is a scared text to
Japanese people and how import it is to keep your word, when the treaty
goes against Japan, we are given lectures about how one must go with the
flow and how a treaty is not seen as fixed in stone but a document that
must change as the situation moves on.