I think the treaties we (U.S.) have signed makes the moon "international" territory, much like the arctic and antarctic..
I'm assuming that is what you are referring to..
However, there are no treaties, international or otherwise, obligating the U.S. to provide transportation to the moon,.
Likewise, to provide support for any other nation's colony or outpost that they may build there...
The point here is that space will not be developed without property rights. That is in the President's Commission report and that is being ignored, and not only by NASA--they cannot do anything about it, it is a legal problem--but by the President, the White House, Congress, the USSC, and by all private entrepreneurs including the ones represented in this article. None of the get it.