The purpose of the article is to present the development and current activities of the National Library of the Republic of Sakha (Yakutia) in the context of N. I. Tyulina’s typological concept, which defines the functions of national libraries as strategic cultural institutions. The study aims to identify the extent and particular features of how the library fulfills core typological functions: forming and preserving the national library collection, creating bibliographic information sources, providing comprehensive information and library services, conducting research, offering methodological support, coordinating the regional library system, and participating in interregional and international projects. Special attention is paid to the transformation of functions under the influence of digitalization, the socio-cultural context of the region, and the challenges of the 21st century. Using the case of the National Library of the Republic of Sakha (Yakutia), the author demonstrates how, by adapting N. I. Tyulina’s typological model to the conditions of the northern region, multilingual environment, and territorial remoteness, the regional library can function as the infrastructural foundation of the library system at the level of a constituent entity of the Russian Federation. The library develops its regional and national collections, builds the integrated cataloging system, and supports the digital library and bibliographic infrastructure. Significant focus is placed on innovation: the creation of the “Unified Digital Environment for Yakutian Libraries”, the introduction of artificial intelligence for to improve service quality, and the expansion of remote access services and interlibrary cooperation. The article concludes that N. I. Tyulina’s typological concept is highly relevant for national libraries of the constituent entities of the Russian Federation, as evidenced by the activities of the National Library of the Republic of Sakha (Yakutia), which performs key typological functions, develops them in modern conditions, and serves as the model of a sustainable regional library institution.
