The sovereignity of foreign states and there territorial integrity according to international law.
"Under present international law, annexation no longer constitutes a legally admissible mode of acquisition of territory as it violates the prohibition of the threat or use of force (Use of Force, Prohibition of). Therefore annexations must not be recognized as legal."
alt Hacker News
The sovereignity of foreign states and there territorial integrity according to international law.
"Under present international law, annexation no longer constitutes a legally admissible mode of acquisition of territory as it violates the prohibition of the threat or use of force (Use of Force, Prohibition of). Therefore annexations must not be recognized as legal."
Src》https://opil.ouplaw.com/display/10.1093/law:epil/97801992316...
Put simply: You must not just build a buffer zone on someone elses territory. (You of course can build one on you own as you wish)