Diplomacy: The U.N. Marches In

But chances are slim that the blue helmets can fulfill an ambitious assignment: bringing peace and stability to Cambodia and Yugoslavia

The United Nations has been in the peacekeeping business for most of its 47 years, but never has it undertaken anything quite so ambitious. Beginning this week, the world body will put 36,000 military and civilian personnel on the ground in Yugoslavia and Cambodia, charged with meeting goals that extend far beyond keeping antagonists from each other's throats. The U.N.'s blue helmets are supposed to disarm and disband combatants -- many still seething over real and imagined grievances -- and prepare the way for the return of hundreds of thousands of refugees. Nor is that all. They are also supposed to...