 Complete the following phrase:  Following the Račak massacre of 45 Kosovar Albanians in January 1999, Walker visited the site and called it an unspeakable atrocity and crime very much against humanity. On January 18, 1999, the FR Yugoslavia government accused him of going far beyond his mandate, and of waging a campaign of disinformation against Serbia, declaring him persona non grata and ordering him to leave the country. A week later, on the intervention by European Council and Russian Federation, Prime Minister of FR Yugoslavia Momir Bulatović froze the decision. The Račak massacre was a pivotal incident in pushing NATO into launching its 