the highest altitude nuclear test ever demonstrated. The test is notable for its Electromagnetic Pulse (EMP) effect, which was felt as far as 1400 km (800 miles) away in Hawaii. USSR The Soviet Union was also researching innovative ways of gaining space supremacy. Two of their most notable efforts were the R-36ORB Fractional Orbital Bombardment System (FOBS) and Polyus orbital weapons system. The R-36ORB was a Soviet ICBM in the 1960s that, once launched, would go into a low Earth orbit whereupon it would de-orbit for an attack. This system would approach North America over the South Pole, thereby striking targets from the opposite direction from that to which NORAD early warning systems are oriented. The missile was phased out in January 1983 in compliance with the SALT II treaty. The SALT II treaty (1979) prohibited the deployment of FOBS systems: Each Party undertakes not to develop, test, or deploy: (...) (c) systems for placing into Earth orbit nuclear weapons or any other kind of weapons of mass destruction, including fractional orbital missiles; On May 15, 1987, an Energia rocket flew for the first time. The payload was a prototype orbital weapons platform Polyus (also known as Polus, Skif-DM or 17F19DM), the final version of which according to some reports could be armed with nuclear space mines and defensive cannon. The Polyus weapons platform was designed to defend itself against anti-satellite weapons with recoilless cannon. It was also equipped with a sensor blinding laser to confuse approaching weapons and could launch test targets to validate the fire control system. The attempt to place the satellite into orbit failed. Soviet high-altitude nuclear tests The Soviet Union executed their own high-altitude tests for the purpose of studying and developing High-Altitude Electromagnetic Pulse (HEMP) weapons. The most notable of these is the 1962 Nuclear Test 184 in which a nuclear bomb was detonated at an altitude of 290 km. The ensuing HEMP damaged a 1000 km long line in Kazakhstan which was designed to be protected from such damage. The electrical damage is comparable to the strongest naturally occurring geomagnetic disturbances recorded. Post-Cold War As the Cold War ended with the implosion of the Soviet Union the space race between the two superpowers ended. The United States of America was left as the only superpower on Earth with a large concentration of the world's wealth and technological advancement. Despite the United States' new