This article describes the development and components of the Estonian Cyber Defense Unit or Küber-Kaitseliit, a voluntary force in the Estonian Defense League. It is distinct from the National Guard and serves as a force multiplier to support other military and commercial sectors of society as needed. The paper argues the key to its success is to invest into both technical and human factors and provide a well-considered legal framework that provides sufficient structure without inadvertently hampering flexibility and response required in successful cyber defense. It also posits that another critical element is to engage in a whole-of-government and whole-of-society approach that includes collaboration and exercising with regional and international partners. Finally, it advocates for ingenuity and creativity as essential elements in finding solutions to address significant threats with limited resources.
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