Abstract: This study aims to substantiate the theoretical and applied principles of the current international law features' research and assessment of its impact on cyberspace. Regarding the study results we found that the EU countries are divided into three groups: highly developed, providing high rates of international law implementation to counter cyberthreats and ensure state stability; mid-developed countries with adequate capacity and capability to ensure high rates of international law implementation to counter cyberthreats and ensure state stability, but their institutional and legal mechanism is imperfect; developing countries and those completing the process of harmonizing national legislation with international law, which slows down countering cyberthreats and does not contribute to greater state stability.