[NonHyloMorph]

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)

[dlubarov]

Sovereignity isn't infallible, and Israel has a very clear Article 51 argument due to Hezbollah's attacks.

As long as it's temporary (even if the end date isn't clear yet), it's an occupation, not an annexation. Occupations can certainly be legal if necessary for self-defense.

The actual solution would be to enforce UNSC 1701 and disarm Hezbollah. Until that finally happens, Israel has no choice but to respond to cross-border terrorist attacks.