Polt called on Serbian authorities to fully cooperate with the tribunal, including the transfer of indictees, particularly former Bosnian Serb army commander Ratko Mladic.
Polt said his government believed that Mladic was in Serbia and that the Serbian government was capable of locating him and transferring him to The Hague.
The US State Department stated on Thursday that the USA would withhold aid worth 10 million dollars Serbia and Montenegro was to receive in 2005 because of the country's failure to cooperate with the UN tribunal.
Serbia and Montenegro will nevertheless receive assistance worth 73.6 million dollars from the United States in 2005, however, the funds will not be granted to the central government but be directed to organisations and programmes dedicated to reforms, State Department spokesman Richard Boucher said in a statement.
Polt said that the suspension of aid would reflect most directly on cooperation with the central Serbian government.
The US will be forced to withdraw US advisors on technical issues from Serbian ministries, and the decision will also have an impact on the reform of the tax system, the country's admission to the World Trade Organisation, economic reforms that are expected to facilitate foreign investments, and assistance to the national air carrier JAT in establishing a direct line to the USA, Polt said.
The ambassador stressed that his government was trying to alleviate the effects which the suspension of aid would have on the people of Serbia and that it would increase assistance to individuals, the private sector, local authorities, civil society, independent media, as well as organisations and programmes committed to reforms.
The USA is willing to reconsider its decision on the suspension of assistance in a very short period of time if the Serbian government fulfils its obligation of full and unconditional cooperation with the UN tribunal, Polt said.