WASHINGTON -- The future of U.N. peacekeepers in Lebanon has split the United States and its European allies, raising implications for security in the Middle East and becoming the latest snag to vex relations between the U.S. and key partners like France, Britain and Italy.

At issue is the peacekeeping operation known as the United Nations Interim Force in Lebanon, whose mandate expires at the end of August and will need to be renewed by the U.N. Security Council to continue. It was created to oversee the withdrawal of Israeli troops from southern Lebanon after Israel's 1978 invasion, and its mission was expanded following the monthlong 2006 war between Israel and the militant group Hezbollah.

The multinational force has played a significant role in monitoring the security situation in s

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