As the result of unsatisfactory performance of the original HN-5, China immediately begun to improve the missile and North Vietnam once again provided China with the original Soviet sample during the Vietnam War, this time the Strela 2M.
由于原来的红缨-5的表现不尽如人意的结果，中国马上开始改进导弹而同时在越南战争期间，北越再次为中国提供了苏联的原型样品，而这次为箭Strela-2M型。