Zagreb-based UN officials are concerned that if more leverage is not brought to bear on the Bosnian Serbs by the Clinton administration, the execution of thousands of Muslims could go unpunished. In the two months since US Ambassador to the UN Madeleine Albright made a dramatic and unusual presentation of classified US spy-satellite photos to the UN Security Council and accused Mladic of ''extraordinary cruelty,'' US officials have not publicly raised the issue.
UN officials in Zagreb warn that the Clinton administration is following a policy based more on political expediency than pursuing justice.
And the senior UN officials close to the Tribunal say that two months after Ms. Albright's presentation, the US government still has not turned over all of the photos it has of the Srebrenica area.
In August, senior US officials said they had more satellite photos that showed other graves, which along with the Nova Kasaba site could hold between 2,000 and 2,700 bodies.
US interest has waned
UN officials have long accused the Clinton administration of releasing the Nova Kasaba photos to deflect criticism from its tacit approval of the Croatian Army's forced removal of 150,000 Serbs from the formerly Serb-held Krajina region of Croatia in early August. The issue of Srebrenica has been dropped, they say, because it no longer fits the administration's agenda.
The issue of war crimes is a crucial one for the Bosnian government and could scuttle the US-brokered peace talks. The Muslim-led Bosnian government is demanding that accused war criminals be turned over to the Tribunal, and access to what the human rights group Amnesty International says are 143 mass graves in Serb territory, be part of any peace agreement.
But without US backing, the demand is unlikely to be met. UN officials predict that the Clinton administration will try to ignore the issue as it hammers out a de facto partition of the country.