Sierra Leone also encouraged Blair's policy of humanitarian intervention. Critics claimed that it led Blair to see military force as "just another foreign policy option" and that the apparent ease of the success shifted his focus towards the effectiveness of the use of force rather than the political and military risks. In his autobiography, Blair described the operation as one of the least-discussed aspects of his time in office but one of the things of which he is most proud. He was keen to intervene in other African nations where civilian populations were at risk, particularly Darfur and Zimbabwe, but a lack of political support, combined with the pressure of large deployments to Afghanistan and Iraq after the 11 September attacks on the United States, prevented further interventions in Africa. It was not until 2011—when Operation Ellamy was launched as part of a multi-national intervention in Libya—that the United Kingdom undertook another military intervention in Africa.