2k11 krug (circle) - nato sa-4 - medium-range, medium-to-high altitude surface to air missile (sam) system.

rockets russia mediumtohigh sam surfacetoair missile mediumrange krug circle system air 2k11 warfare warhead attack protection rocket military defense army vehicle fighting equipment antiaircraft weapon launcher flak defender base peace alert battle technology launch combat war aircraft projectile threat armed ballistic aggression violence destruction nato sa-4 medium-range medium- -high altitude surface anti- anti-aircraft medium- -high system