That dire assessment comes in advance of President Clinton�s high-profile visit to Kosovo this month. The Clinton administration since 1995 has referred to its policy of promoting multiethnicity in the Balkans as a centerpiece of its foreign policy. But a senior U.S. official fresh back from a trip to the province said he was �extremely disappointed� with the inability of the U.N. mission to get a handle on its mandate to improve stability and protect minorities.