Serhii Nazarovets

This study investigates the effect of article processing charge (APC) waivers on the participation of Ukrainian researchers in fully Gold Open Access journals published by the five largest academic publishers during the period 2019-2024. In response to the full-scale war launched against Ukraine in 2022, many publishers implemented extraordinary APC waiver policies to support affected authors. Using bibliometric data from the Web of Science Core Collection, this study examines trends in Ukrainian-authored publications in fully Gold OA journals before and after 2022, comparing them with those in neighbouring countries (Poland, Czech Republic, Hungary, and Romania). The results reveal a substantial post-2022 increase in Ukraine's Gold OA output, particularly in journals by Springer Nature and Elsevier. While this growth appears to correlate with the introduction of APC-waivers, additional factors, such as international collaborations, emergency grant support, and individual publishing strategies, also contributed. Disciplinary differences and publisher-specific patterns are observed, with notable increases in medical and applied sciences. The study highlights the potential of targeted support initiatives during crises but also points to the limitations of APC-based models in achieving equitable scholarly communication.