Introduction: During its long and dramatic history, Montenegro has had close political, economic, and cultural ties with Russia. However, in the context of architecture, the connections between these two countries are the least known and explored. Purpose of the study: The present study aims to present for the first time some of the most significant achievements made by Russian architects in the city of Nikšić in Montenegro in the period between the end of the 19th and the first half of the 20th century to a wider professional audience. We present two cases: the project of the Cathedral Church of Saint Basil of Ostrog, which was designed by the architect Mikhail Timofeevich Preobrazhensky, and the project of the Upper Ostrog Monastery, the most significant achievement of the architect Vladimir N. Sukurenko. Methods: The methodological approach required classification and comparison of archival materials through the processes of synthesis, analysis, and deduction. Based on the guidelines of the Law on the Protection of Cultural Property of Montenegro, we formed criteria that were used to evaluate the work of the aforementioned architects. The criteria are sorted into three groups. The first group involves building characteristics, where we evaluate authenticity and integrity, degree of preservation, uniqueness, and rarity. In the second group, covering the significance of the building, we assess the historical and scientific significance, archaeological significance, architectural and artistic significance, and technical significance. Finally, in the third group of criteria, we study the age of the buildings, social and economic importance, environmental and landscape importance. Results: Based on our criteria, we find that the Cathedral Church of Saint Basil of Ostrog is a symbol and the most important spatial element of the identity of the city of Nikšić, while the Upper Ostrog Monastery, one of the most important sanctuaries in orthodox Christianity, represents the pinnacle of the construction and architectural process.
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