So is everyone with enough power, every law requires enforcement. But even without enforcement or with the ability to outright block laws, being in violation of international law still matters. It informs others whether you truly belief in a rule-based order or whether you only use it as a tool if it benefits you and they will adjust their behavior accordingly. Also if you want support from others, if you are in violation of international law, the others will think twice if they should support you.
