Toad, I think I found it...at least in princple.
"The Security Council reaffirms its commitment to the full
sovereignty, political independence, territorial integrity and national
unity of Lebanon within its internationally recognized boundaries. In this
context, the Council asserts that all States shall refrain from the threat
or use of force against the territorial integrity or political independence
of any State, or in any manner inconsistent with the purposes of the United
Nations."
http://daccessdds.un.org/doc/UNDOC/GEN/N00/270/49/PDF/N0027049.pdf?OpenElementFrom resolution 425,
"1.
Calls for strict respect of the territorial integrity, sovereignty and political independence of Lebanon within its internationally recognised boundaries;"
Can't really have sovereignty if you have armed military personal from foreign nations running around your country I would guess.