BEIRUT—For nearly two decades, thousands of United Nations peacekeepers have been helpless to stop the Iran-backed militant group Hezbollah from rearming along Israel’s border since the two sides’ previous war.

       Now that Israel and Hezbollah have come to a cease-fire ending a year of fighting, the United Nations Interim Force in Lebanon, or Unifil, is again at the center of efforts to keep the peace but still lacks the capability to enforce a buffer zone between the parties, analysts said.

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