The Republic of Nicaragua v. The United States of America, was a judgement by the International Court of Justice that the United States had violated international law by supporting Contra guerrillas in their war against the Nicaraguan government, and by mining Nicaragua's harbors. The United States refused to abide by the Court's decision, even though it was obligated to do so under international law. After the Court's decision, the United States withdrew its declaration accepting the Court's compulsory jurisdiction.
http://www.wikipedia.org/wiki/Nicaragua_v._United_States
http://www.icj-cij.org/icjwww/icases/inus/inus_isummaries/inus_isummary_19860627.htm
http://www.icj-cij.org/icjwww/icases/inus/inusframe.htm
http://www.wikipedia.org/wiki/Nicaragua_v._United_States
http://www.icj-cij.org/icjwww/icases/inus/inus_isummaries/inus_isummary_19860627.htm
http://www.icj-cij.org/icjwww/icases/inus/inusframe.htm