With the changing global security situation, increase in external threats or emergence of new ones (cyberattacks, non-conventional warfare models, etc.), countries must feel concern regarding consolidation of their security. In this regard, both the Republic of Lithuania and Ukraine are taking measures to enhance and expand their military forces. One of the means to fortify military forces is attracting citizens to serve in the civilian national defence service. Authors of the article employ a comparative aspect to analyse the need for statutory servants serving in the civilian national defence service, as well as reveal the number and type of professionals to be required by the national defence system and explore benefits provided by such statutory servants as well as their purpose in the army. Additionally, in the article authors reveal administrational-legal status of civilian national defence services in both the Republic of Lithuania and Ukraine, its place in the system of other militarised or civil public administration institutions. Comparative aspect is also used to analyse administrative legal status of statutory servants of civilian national defence service, peculiarities of admission of statutory servants to the national defence system and their service therein, as well as possibilities for motivation and stimulation of citizens to exercise service in the civilian national defence service. Therefore, the article aims to answer the question of what could motivate citizens to carry out service in the civilian national defence service, what incentives (needs, interests, values, stimulus, realisation of importance of certain matters, remuneration, etc.) would result in motivation (attitude and interest in) to serve in the Lithuanian Armed Forces and to participate in international operations.