The government of Serb-dominated Yugoslavia threatened to seal off its 300-mile border with Bosnia, essentially ostracizing the Bosnian Serbs it has been supporting in the civil war. Is Serbian President Slobodan Milosevic serious about cracking down on the battling Bosnians? We'll see in the days and weeks to come, says TIME's Central Europe Bureau Chief James Graff. For now, Yugoslavia's pugnacious stance towards its cousins eases the pressure on Western countries to punish the Bosnian Serbs, who rejected a peace plan last week. "Milosevic is doing all the dirty work for (the West)," says Graff. "So any consideration of real robust military actions does not have to be on the front burner."