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Ultimately, an armed military UN backed buffer force will be inserted in South Lebanon. Any attacks on it will be seen as an attack on the UN. Hopefully, as many nationalities as possible will contribute. Those Nations will find it very difficult to withdraw their troops from a UN mandated mission. Hopefully Israel will be guaranteed security by the UN as part of it.

With all due respect, there was already an "armed military UN backed buffer force" in South Lebanon -- UNIFIL -- which was there to "guarantee security" for Israel.

However, UNIFIL saw Hezbollah arming itself and building fortified strong points...and did absolutely nothing about it. UNIFIL was still "in place" when this war began!

Any multi-national force cannot be a UN operation.

The United Nations Interim Force in Lebanon, UNIFIL, is one of the UN’s oldest peacekeeping operations. Its nearly 2,000 troops and 50 unarmed military observers are tasked with seeking to maintain a ceasefire along the 70-mile (121 km) United Nations “Blue Line” between Israel and Lebanon, by patrolling, observing, reporting violations and liaising with the parties.

UNIFIL was established in 1978 by the United Nations Security Council (Resolution 425). The Council authorized “a United Nations interim force for Southern Lebanon for the purpose of confirming the withdrawal of Israeli forces, restoring international peace and security and assisting the Government of Lebanon in ensuring the return of its effective authority in the area….”

See, a pasive force, no military enforcement at all.
http://www.un.org/Depts/dpko/missions/unifil/factsheet.pdf