 The Aegis system has been designed to defend against mass attacks by hostile anti-ship missiles or warplanes.Any missiles that can elude the interception by medium-ranges SAM missiles can then be either deceived with electronic countermeasures or decoys; shot down by short-range missiles such as the Sea Sparrow or the Rolling Airframe Missile (RAM); engaged by the warship's main gun armament (if present); or, as a last resort, destroyed by a close-in weapon system (CIWS), such as the American Phalanx CIWS, Russian Kashtan CIWS, or the Dutch Goalkeeper CIWS.To counter these defense systems, countries such as Russia are developing or deploying very low-flying missiles (about five meters above sea level) that slowly cruise at a very low level to within a short range of their target and then, at the point when radar detection becomes inevitable, initiate a supersonic, high-agility sprint (potentially with anti-aircraft missile detection and evasion) to close the terminal distance.