 Complete the following phrase:  In December 2009, she became the inaugural High Representative of the Union for Foreign Affairs and Security Policy that was created by the Treaty of Lisbon. As High Representative, Ashton served as the EUs foreign policy chief. Despite being criticised by some, particularly at the time of her appointment and in the early stages of her term of office, for her limited previous experience of international diplomacy, Ashton subsequently won praise for her work as a negotiator in difficult international situations, in particular for her role in bringing Serbia and Kosovo to 