Well, some supporting information from this article should be noted:
Iraq's interior minister is demanding that his country's neighbors take stronger measures to stem the flow of money and recruits to insurgents who have been slaughtering civilians as they battle U.S. and Iraqi forces.
The minister does not mention weapons. Nor does he just say general support. He is instead very specific. Recruits and money remain the major foreign inputs for this insurgency/terror campaign.
Interdicting this traffic requires action well before the berms on the Iraq-Syria border.