 During the 1970s and 1980s, Libya's unsuccessful border conflicts with Egypt and Chad, support for foreign militants, and alleged responsibility for the Lockerbie bombing in Scotland left it increasingly isolated on the world stage.A particularly hostile relationship developed with the United States, United Kingdom, and Israel, resulting in the 1986 US bombing of Libya and United Nations–imposed economic sanctions.From 1999, Gaddafi shunned Arab socialism and encouraged economic privatization, rapprochement with Western nations, and pan-Africanism; he was Chairperson of the African Union from 2009 to 2010.