Ключевые слова: barbed wire, barrier, barrier protection, blockade, boundary, boundary protection, concrete fence, defend, defend area, defense, defensive, enclose, fence, fortification, fortify, heightened, heightened security, intruders, metallic, perimeter, perimeter defense, perimeter wall, prevent, protection, restrict, restrict access, safe area, safeguard, secure, secure area, security, security fencing, security measure, sharp, summit, top, wall, wire,