# Bulgaria-Slovakia diplomatic and energy cooperation > Live situation record from CLSTR: https://clstr.news/situations/bulgaria-slovakia-diplomatic-and-energy-cooperation > Updated: 2026-09-04T17:42:56.000Z. Sources: 14. Developments: 2. Bulgaria and Slovakia have engaged in high-level diplomatic discussions focused on regional security, energy, and European Union policy. Leaders from both nations have emphasized that the conflict in Ukraine must be resolved through diplomacy and negotiations rather than military means. In terms of energy and industry, the two countries are collaborating on nuclear energy projects, including negotiations for AP1000 reactors, and have agreed to form a joint commission to share scientific expertise. Defense cooperation has also emerged as a priority, with discussions regarding aviation maintenance and ammunition production technologies. To strengthen their influence within the European Union, particularly concerning cohesion policies and the Multiannual Financial Framework, Slovakia has proposed a ‘V4 plus’ cooperation model. This initiative would involve Bulgaria in expert-level coordination with the Visegrad Group to enhance collective negotiating power. ## Timeline ### 2026-09-04: Slovakia proposes ‘V4 plus’ cooperation model to Bulgaria Slovak officials proposed a ‘V4 plus’ cooperation model to Bulgaria to enhance EU negotiating power and discussed defense partnerships involving aviation maintenance and ammunition technology. 4 sources. https://clstr.news/cluster/slovakia-proposes-v4-plus-cooperation-model-to-bulgaria ### 2026-09-04: Bulgaria and Slovakia seek diplomatic solution for Ukraine and nuclear energy cooperation Bulgarian and Slovakian leaders met to advocate for a diplomatic end to the Ukraine conflict and to strengthen cooperation in nuclear energy, including joint projects with Westinghouse. 10 sources. https://clstr.news/cluster/rumen-radev-and-robert-fico-discuss-energy-and-security --- Cite as: Bulgaria-Slovakia diplomatic and energy cooperation. CLSTR, https://clstr.news/situations/bulgaria-slovakia-diplomatic-and-energy-cooperation