Controlled vocabularies are terminologies to describe domain knowledge and assist with various tasks related to computer systems communication. For instance, controlled vocabularies reduce data ambiguity by referencing term definitions, support the development of taxonomies, facilitate integration of concepts across ontologies, and support the semantic interoperability between disparate computer systems for the exchange of data. Cyberwarfare-related informatics research is driven by the gathering and use of information relevant to defense and warfare. Before computing complex tasks, computer tools and applications require formal representations of the information and knowledge they process. The purpose of this study is to propose the design of a novel controlled vocabulary for the description of armed conflict-related events with the focus on the Russo-Ukrainian conflict. Data about this research is collected from the NATO Newsroom. The simple knowledge organization system (SKOS) recommendation is utilized to encode the data. The initial version of a methodology for the formal representation of defense knowledge using semantic web technologies is presented in this paper.