Provide a source to your claim that "the demilitarization of a region can not be done just in effect of one party.". Now. Right now, I expect a full
ing internationally recognized source. I've had it with your BS, I've sourced everything I've said and all you're doing is make blanket statements about the nature of international law that you just make up on the spot. You do need a legal opinion, can't handwave it and pretend like you dont need it. You dont get to argue from a position where everything you decide to concoct is presumed true in particular given the amazing ignorance of the subject matter displayed in your posts. Present it, right now.
If anyone is interested, you can look at both the Wimbeldon case and Aaland islands cases for examples proving my point.
In the Wimbeldon case, which concerned the status of the Kiel canal as an area of free passage, the Court found that the Treaty of Versailles (art 380) constituted an objective regime. To this end it wasnt enough that it concerned the status of territory. The reason it constituted an objective regime in the opinon of the Court was that the Treaty provided, in its article 380, that:
"The Kiel Canal and its approaches shall be maintained free and open to the vessels of commerce and of war
of all nations at peace with Germany on terms of entire equality."
Similarly the Court found that articles 381-386 stressed the point of article 380 that all nations were to be treated equally in the use of the canal.
Thus the Court stated:
"This clause, they say, could not be more clear as regards the provision to the effect that the canal shall be maintained free and open to the vessels of commerce and of war of
all nations at peace with Germany;
it follows therefore, that the S.S. "Wimbledon",
belonging to a nation at that moment at peace with Germany, was entitled to free passage through the Canal."
"The Court considers that the terms of article 380 are
categorical and give rise to no doubt. It follows that the canal has ceased to be an internal and national navigable waterway, the use of which by the vessels of states other than the riparian state is left entirely to the discretion of that state,
and that it has become an international waterway intended to provide under treaty guarantee easier access to the Baltic for the benefit of all nations of the world."
Observe thus that the Court clearly stresses the erga omnes, or prevailing general interest, character of the canal ("for the benefit of all nations of the world"). It is this reason that results in its character of an objective regime.
The Aaland/Åland islands case provides for another point. As with the Kiel canal it concerns status of territory. Unlike the Kiel canal and more relevant to our discussion, that status is specifically demilitarization. Sweden had argued that the status of demilitarization for the Aaland islands was of objective regime character. The very fact that the matter had to be discussed demonstrates in and of itself that it doesnt follow automatically, but here's what was said by the Commission appointed by the League of nations:
Commission of Jurists appointed by the League of Nations (The Report of the Commission of Jurists in LNOJ, Supplement Special, No. 3 (1920)):
"Thus, admitting that the provisions of 1856 relating to the Aaland Islands bear the character of a settlement regulating
European interests, it becomes obvious that such a settlement cannot be
abolished or modified either by the acts of one praticular Power or by conventions between some few of the Powers which signed the provisions of 1856, and are still parties to the Treaty.
...
These provisions were laid down in European interests. They constituted a special international status relating to military considerations, for the Aaland Islands. It follows that until these
provisions are duly replaced by others, every State interested has the right to insist upon compliance with them. [...]"
You'll note that the Commission is careful to stress that the demilitarization was done in
European, that is to say common, general, interests. Not in the interests of one or two nations, but in the interests of an entire continent.
I'll thank you to stop making things up.