Kaiser Wilhelm II invaded neutral Belgium to start WWI. Hitler swallowed Austria and Czechoslovakia when it suited him; but Austria's neutrality after 1955 was enough to satisfy the Cold War's two blocs, and now it is part of the EU.
乌克兰前进的道路还难以辨认——这不仅因为缓冲国过去的经历有矛盾之处。德皇威廉二世入侵中立比利时发动首次世界大战。希特勒一待时机成熟就吞并了奥地利和捷克斯洛伐克；但1955年后奥地利的中立得到了冷战两大阵营的认可，而奥地利现在已成为欧盟成员国。