5. 9 月 12 日，科索沃反对党科索沃民主联盟、自决运动、科索沃社会民主党和替代运动的领导人联名致函欧洲联盟外交与安全政策高级代表费代丽卡·莫盖里尼，反对武契奇总统和萨奇总统的“边界调整”提议，并就“边界调整”对区域和平与稳定构成的潜在负面影响发出警告。9 月 29 日，自决运动在普里什蒂纳组织了一次抗议游行，反对萨奇总统提出的任何与贝尔格莱德达成的最终协议都应包含“边界调整”的建议，据报约有 20 000 人参加游行。
5. On 12 September, the leaders of the Kosovo opposition parties Democratic League of Kosovo, the Movement for Self-Determination (Vetëvendosje), the Social Democratic Party of Kosovo and Alternativa addressed a joint letter to the European Union High Representative for Foreign Affairs and Security Policy, Federica Mogherini, expressing disagreement with the “border adjustment” proposal put forth by Presidents Vučić and Thaçi and warning about the potentially negative impact of “border adjustments” on peace and stability in the region. On 29 September, Vetëvendosje organized a protest march in Pristina against the proposal of President Thaçi to include “border adjustments” in any final agreement with Belgrade, with around 20,000 people reportedly in attendance.