BLU 2025 - workshop of the Bulgaria – Latvia – Ukraine Initiative for Space Weather Investigations June 2-6, 2025 Primorsko, Bulgaria Main topics: Key areas of space weather research at participating organizations Solar flare studies and related phenomena Discussion of ongoing and prospective joint projects Regional, European, and international programs on solar and space weather research and applications Support for Ukraine in restoring its scientific and technical research capacity Organizational and coordination matters Organisations: Space Research and Technology Institute (SRTI), Sofia, Bulgaria Engineering Research Institute of Ventspils International Radio Astronomy Centre (ERI VIRAC), Ventspils University of Applied Sciences (VUAS), Ventspils, Latvia Institute of Radio Astronomy of the National Academy of Sciences of Ukraine (IRA NASU), Kharkiv, Ukraine Odesa Radio Astronomy Observatory "URAN-4", Institute of Radio Astronomy of the National Academy of Sciences of Ukraine (IRA NASU), Odesa, Ukraine S.I. Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine (IG NASU), Kyiv, Ukraine Odesa I.I. Mechnikov National University, Faculty of Mathematics, Physics and Information Technologies, Odesa, Ukraine For more information: Vladislavs Bezrukovs (VIRAC, Latvia) vladislavsb@venta.lv Artem Sukharev (VIRAC, Latvia) artem.sukharev@venta.lv Mikhail Rybov (IRA NASU, Ukraine) ryabov-uran@ukr.net Volodimir Komendant (SRTI, Bulgaria) votan1360@gmail.com