 Complete the following phrase:  Croatia also started a Membership Action Plan at the 2002 summit, leading to a national debate on whether a referendum on NATO membership needed to be held there. Croatian Prime Minister Ivo Sanader ultimately agreed in January 2008, as part of forming a coalition government with the HSS and HSLS parties, not to officially propose one. Montenegro declared independence on 3 June 2006, and the new country subsequently joined the Partnership for Peace programme at the 2006 Riga summit. Albania and Croatia were invited to join NATO at the 