In recent years Japan has sought to rekindle diplomatic, political and economic ties with Eastern Europe. This Brief examines how Russia’s annexation of Crimea in 2014 may have motivated this charm offensive, prompted by Tokyo’s fears that such aggression could potentially be replicated in the Far East, as well as by concerns about transfers of military technology from Eastern Europe to China and the weakening of the global non-proliferation regime. It shows how Japan’s foreign policy goals in the eastern neighbourhood overlap with those of the EU, and highlights the potential for strengthening synergies between them.