Bihać to represent an end to Croatia's war effort. In March 1994, the Washington Agreement was signed, ending the Croat–Bosniak War, and providing Croatia with US military advisors from Military Professional Resources Incorporated (MPRI). The US involvement reflected a new military strategy endorsed by Bill Clinton in February 1993. As the UN arms embargo was still in place, MPRI was hired ostensibly to prepare the HV for participation in the NATO Partnership for Peace programme. MPRI trained HV officers and personnel for 14 weeks from January to April 1995. It has also been speculated in several sources, including an article in The New York Times by Leslie Wayne and in various Serbian media reports, that MPRI may also have provided doctrinal advice, scenario planning and US government satellite intelligence to Croatia, although MPRI, American and Croatian officials denied such claims. In November 1994, the United States unilaterally ended the arms embargo against Bosnia and Herzegovina, in effect allowing the HV to supply itself as arms shipments flowed through Croatia. The Washington Agreement also resulted in a series of meetings between Croatian and US government and military officials in Zagreb and Washington, D.C. On 29 November 1994, the Croatian representatives proposed to attack Serb-held territory from Livno in Bosnia and Herzegovina, in order to draw away part of the force besieging Bihać and to prevent the town's capture by the Serbs. As the US officials gave no response to the proposal, the Croatian General Staff ordered Operation Winter '94 the same day, to be carried out by the HV and the Croatian Defence Council (HVO)—the main military force of Herzeg-Bosnia. In addition to contributing to the defence of Bihać, the attack shifted the HV's and HVO's line of contact closer to the RSK's supply routes. In 1994, the United States, Russia, the European Union (EU) and the UN sought to replace the Vance plan, which brought in the UNPROFOR. They formulated the Z-4 Plan giving Serb-majority areas in Croatia substantial autonomy. After numerous and frequently uncoordinated changes to the proposed plan, including leaking of its draft elements to the press in October, the Z-4 Plan was presented on 30 January 1995. Neither Croatia nor the RSK liked the plan. Croatia was concerned that the RSK might accept it, but Tuđman realised that Milošević, who would ultimately make the decision for the RSK, would not accept the plan for fear that it