SARAJEVO, July 31 (Reuters) - The United States on Monday imposed sanctions against four top Bosnian Serb officials, including the Serb member of the country's presidency, for undermining a U.S.-sponsored peace deal that ended the Balkan country's war in the 1990s. The constitution is part of the Dayton peace accords that ended the 1992-1995 Bosnian war in which 100,000 were killed, dividing the country into two autonomous regions, the Serb Republic and the Bosniak-Croat Federation, linked via a weak central government. Late in June, lawmakers in the Serb Republic voted to suspend rulings by Bosnia's constitutional court, a vote initiated by the region's separatist pro-Russian President Milorad Dodik who is already under U.S. and UK sanctions. "This action threatens the stability, sovereignty, and territorial integrity of Bosnia and Herzegovina and the hard-won peace underpinned by the Dayton Peace Agreement," said Under Secretary of the Treasury for Terrorism and Financial Intelligence Brian E. Nelson. They stepped up activities undermining state institutions in recent months, including suspension of decisions by an international peace envoy.

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Persons: Bosnia's, Zeljka Cvijanovic, Matthew Miller, Milorad Dodik, Radovan Viskovic, Milos Bukejlovic, Nenad Stevandic, Brian E, Nelson, Cvijanovic, Stevandic, Radovan Kovacevic, Dodik, Daria Sito, Nick Macfie Organizations: Bosnian, U.S . State Department, - Croat Federation, Russian, U.S . Department of, Treasury, Terrorism, Financial, Dodik, Thomson Locations: SARAJEVO, United States, U.S, Serb Republic, Bosnian, Dayton, Bosnia, Herzegovina, Serbia