It is obvious from past experience that any incursion into Gaza or attempts to weed out militants in covert operations will not bring any long term results. It's time to tackle the problem from another angle: use international mediation to call an immediate cease fire of both sides on all fronts: Gaza and the West Bank. If Qassam fire is indeed a response to IDF military actions in the WB, then such a move would compel the Palestinian unity government to curb its militants, and leave them no more excuse for attacks. Israel has never put this tactic to the teset because there has never been a full stop to military actions in the WB even after the cease-fire was called in Gaza. It's time to give it a try. At the same time I would advocate contacts with Egypt such as those begun by Livni to gain Egypt's cooperation in curbing additional smuggling of weapons from Egypt into the Gaza strip.
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from the article: Gov't to give Gaza arms smuggling top priority in diplomatic meetings