As a bilateral treaty, both China and Japan should perform the Sino-Japan United Declaration according to the principle of 'Pacta Sunt Servanda'.

《中日联合声明》是一个双边条约，中日双方都必须根据“约定必须遵守”原则履行该约。

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First, Pacta Sunt Servanda principle is the leading principle of solving territorial disputes; international treaty is the overriding criterion of solving territorial disputes.

首先，条约必须遵守原则是解决领土争端必须遵守的首要原则，国际条约是解决国际领土争端的首要依据。

youdao

First, Pacta Sunt Servanda principle is the leading principle of solving territorial disputes; international treaty is the overriding criterion of solving territorial disputes.

首先，条约必须遵守原则是解决领土争端必须遵守的首要原则，国际条约是解决国际领土争端的首要依据。

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