noun
armed neutrality
A political or military stance where a state remains neutral but maintains armed forces to defend that neutrality.
スイスは長年、武装中立を国是としてきた。
Switzerland has long upheld armed neutrality as a national policy.
中立 is general neutrality, while 武装中立 specifically adds the condition of maintaining armed forces.
Compound of 武装 (armed) and 中立 (neutrality), likely a calque from Western political terminology.