International laws and reality.
The laws that everyone agrees on and accepts, the ultimate dispute resolution, are the laws of physics. If you can apply more force, you win the dispute.
If there is a dispute in nature between a lion and a hayina who own a carcass, the dispute is resolved and the ownership goes to the animal with more force.
The problem with resolving conflict by force is that such an indisputable dispute resolution process is the cost. Wars are expensive and deadly.
Therefore, humans came up with the idea of a less destructive dispute resolution mechanism called law. Ownershi