But that's begging the question, isn't it? If the UK recognizes Sealand as another country, then of course the difference is split. But the UK clearly doesn't

But that's begging the question, isn't it? If the UK recognizes Sealand as another country, then of course the difference is split. But the UK clearly doesn't, so it will just consider Sealand part of its territorial waters, and every other country (that doesn't recognize Sealand) will side with UK here.