The North Korean Taepo Dong program traces its origins to the No Dong medium-range ballistic missile program of the late 1980s. In the early 1990s, North Korea initiated the development of two ballistic missile programs known to the West as Taepo Dong 1 and Taepo Dong 2. The reported design objectives for the Taepo Dong 1 system were to deliver a 1,000 to 1,500 kg warhead to a range of 1,500 to 2,500 km and for the Taepo Dong 2 to deliver the same warhead to a 4,000 to 8,000 km range. Initial prototypes for both systems were probably manufactured in 1995 or 1996 with a possible initial production run for the Taepo Dong 1 initiated in early 1997 or 1998. Some analysts estimated that North Korea may have produced from one to ten Taepo Dong 1 and one or two Taepo Dong 2 prototypes by the end of 1999. These missiles are not believed to be deployed. North Korea is believed to have had extensive foreign assistance from China, Russia, Pakistan, and Iran throughout the program. Very little was known about the actual program until the August 31, 1998 launch of a Taepo Dong 1 (or Paektusan-1) from the Musudan-ri Launch Facility in North Hamgyong Province, northeast coast of North Korea. The stated objective of this launch was to place North Korea's first satellite into orbit. Initial U.S. intelligence reports postulated that the Taepo Dong 1 SLV was only a two-stage rocket. The first stage fell into international waters 300 km east of Musudan-ri and the second stage flew over the Japanese island of Honshu and fell into the water 330 km away from the Japanese port of Hachinohe for a total distance of approximately 1,646 km. Further analysis of radar tapes reportedly revealed that the Taepo Dong 1 had a small third solid propellant stage (presumably designed to place the satellite into orbit). Some debris from this third stage was believed to have impacted as far as 4,000 km from the launch point. Some analysts believe that if the missile had functioned properly, the Taepo Dong 1 space launch vehicle (SLV) could have achieved a 3,800 to 5,900 km range. North Korean media claimed the satellite entered earth orbit. In order to strike targets from North Korea, a North Korean missile would need to achieve the following ranges: Within possible range of the Taepo Dongs are U.S. military facilities in Guam (3,500 km), Okinawa, and Japan. The Taepo Dong 1 missile (as opposed to the SLV) is believed to be a two-stage missile that uses a No Dong missile derivative as its first stage and SCUD C derivative (called the Hwasong 6) as its second stage. In this configuration, it is estimated that it could deliver a 700 - 1,000 kg warhead to a range of 2,500 km, which could put Japan and Okinawa within range. For the Taepo Dong 1 to achieve greater range its payload would have to be decreased. Some analysts speculated that a reduced-payload configuration could deliver a 200 kg warhead into the U.S. center and a 100 kg warhead to Washington D.C., albeit with poor accuracy. Until a few years ago, the Taepo Dong 2 had not yet been flight tested. (It has also been called the Moksong 2 and the Pekdosan 2.) The Taepo Dong 2 is believed to be a two-stage missile about 35 meters long. The first stage has been said to bear close resemblance to the Chinese CSS-2 and CSS-3 first stage. The second stage is believed to be based on the No Dong missile. The two-stage variant is assessed by some to have a range potential of as much as 3,750 km with a 700 to 1,000 kg payload and, if a third stage were added, some believe that range could be extended to 4,000 to 4,300 km with a full payload. Some analysts further believe that the Taepo Dong 2 could deliver a 700 to 1,000 kg payload as far as 6,700 km. Pyongyang has yet to test the guidance system, and so the missile is believed to be inaccurate. How it might be deployed (i.e., silo or transportable) also remains undetermined, although some have suggested it is a road mobile system. In order to achieve ranges capable of striking Hawaii and targets on the U.S. mainland, some analysts believe that the Taepo Dong 2's payload would need to be reduced to 200 - 300 kg. Some believe the Taepo Dong 2 may be exported to other countries in the future. In June 2006 the Taepo Dong 2 (or Paektusan-2) was observed being assembled and fueled at the Musudan-ri test site along the northeast coast of North Korea. At that time, some observers believed a test was imminent while others expressed caution because considerable technical uncertainty remained. On July 4, 2006, North Korea launched the Taepo Dong 2. The launch was preceded by three shorter-range ballistic missile launches, and then followed by three more. About 40 seconds into the flight, the Taepo Dong 2 failed on its own during the first stage and fell into the Sea of Japan, according to USNORTHCOM (U.S. Northern Command). Causes for the failure were studied, but details were not made public. Japanese sources reported some details of the missile launches, suggesting greater accuracy in their impact areas than other analyses. Others have suggested structural failure of the airframe, or failure of the propulsion or guidance system as the causes. The report also suggested greater Russian engineering support than indicated elsewhere. Some believe initial production of the Taepo Dong 2 may have started in 2005, and that perhaps 20 missiles were built in 2006. In early February 2009, various reports indicated that North Korea was making test preparations for a Taepodong-2 launch by setting up radar and other monitoring equipment around a missile test site along its northeast coast. Secretary of State Clinton said any such test would "be very unhelpful in moving our relationship forward" and that it would violate a 2006 UN Security Council Resolution (Resolution 1718) demanding that North Korea "not conduct any further nuclear test or launch of a ballistic missile." Similarly, the South Korean government warned any missile test would "be a serious threat." In late February 2009, North Korea announced that it was preparing to launch a communications satellite, similarly to what it said about the 1998 test. Some experts continue to register some concern over North Korea's level of military spending in relation to its missile program. North Korea may spend as much as 40 percent of its gross domestic product (GDP) on the military. In 2004, U.S. Forces Korea commander, General Leon J. LaPorte, reportedly stated that North Korea's military investments are primarily in their nuclear, biological, chemical and missile programs in order to gain an "asymmetrical" advantage over U.S and South Korean forces. General LaPorte reportedly emphasized his concern over missile development and North Korea's continued development of its nuclear weapons program that could eventually lead to "weaponizing their weapons-grade materials on missiles." North Korea's apparent willingness to devote such a large portion of its GDP to missiles and weapons of mass destruction could be cause for additional concern when viewed in the light of their alleged cooperation with other countries. Evidence suggests that North Korea has had extensive dealings with Iran, Pakistan, Russia, Syria, Yemen, and Libya on ballistic missiles and possibly even nuclear warheads. One particular concern is that Chinese warhead designs, sold to Libya by Pakistani nuclear scientist Dr. A.Q. Khan, might also be in the hands of North Korea, which could help accelerate its efforts to develop long-ranged nuclear ballistic missiles. Some suggest that North Korea's access to these countries' missile and WMD technologies might enable North Korea to advance its long-range nuclear ballistic missile program at a more accelerated rate without having to conduct extensive testing, particularly if they use proven missile designs from other countries. Various reports indicate that North Korea may be developing and deploying at least two new medium to intermediate-range ballistic missile systems. The Japanese Defense Ministry reportedly believes North Korea has about 200 Nodong medium-range missiles. It is not publicly known if North Korea is continuing development of a reported new version of its Taepo Dong ballistic missile, the so-called Taepo Dong X, which might achieve intercontinental ranges. The two new medium to intermediate-range missiles are believed to be based on the decommissioned Soviet R-27 submarine launched ballistic missile. The R-27, which was allegedly acquired from Russia in the 1990s and possibly enhanced with the help of Russian missile specialists, has been called an "excellent choice" on which to base a new missile system. Its 40 year-old, liquid-fueled technology is considered within the technological and industrial capabilities of North Korea and versions of its engines are already used in North Korean SCUDs and No Dongs. Perhaps the greatest advantage of this system, according to some observers, is that the R-27 is a proven design meaning that North Korea may be able to develop and deploy these missiles without having to conduct extensive ground and flight tests. In February 2009, South Korea's Defense Ministry reported that North Korea had deployed a new type of medium-range ballistic with a range estimated at 1,800 miles. This missile is believed to be the same type seen at a military parade in North Korea in 2007. Additional details, such as the name of this missile and how many are deployed have not yet been made public. The land-based version called Musadan or No Dong B is a medium to intermediate-range ballistic missile with an estimated range of 2,500-3,200 km. The North Korean version of this missile is 12 m long—2.4m longer than the R-27—and, although smaller than the No Dong and Taepo Dong 1, it has a greater range than these two missiles. This could put most of East Asia within its range, including U.S. military bases at Guam and Okinawa, although experts point out that the North Korean No Dong 2 missile could also reach Japan and Okinawa. Initial prototypes of the land-based version were reportedly first identified in 2000, and pre-production models and a new transporter-erector-launcher (TEL) were believed to have been completed by mid-2003. The Musadan has not been flight-tested. Although some remain uncertain whether it is deployed, others report that perhaps 15-20 Musadan have been deployed without apparent testing. The North Koreans reportedly began constructing two new missile bases to accommodate the Musadan/No Dong B. One base is near Yangdok-gun and the other is at Sangnam-ni, previously reported as a No Dong and Taepo Dong base. North Korea reportedly constructed administrative and maintenance facilities at these two sites as well as fortified underground tunnels for storing the missiles and TELs. The sea-based version of the R-27 is reportedly either a submarine or ship-mounted system with an estimated range of at least 2,500 km. Russian versions of the R-27 reportedly had both a single nuclear reentry vehicle as well as a version with three reentry vehicles, each with a 200 kiloton (KT) nuclear weapon. It is not known if North Korea possesses reentry vehicles for their versions of the R-27. In any such case, they have not been tested by North Korea There are indications that North Korea may be actively pursuing a sea-based ballistic missile capability, which also could have potential security implications for the United States. In September 1993, the Korean People's Navy (KPN) reportedly purchased 12 decommissioned Russian Foxtrot class and Golf-II class submarines for scrap metal from a Japanese company. The Golf-IIs, which are capable of carrying three SS-N-5 SLBMs, did not have their missiles or electronic firing systems when they were sold to the North Koreans, but they did allegedly retain significant missile launch sub-systems including launch tubes and stabilization systems. Some analysts believe that this technology, in conjunction with the R-27's well-understood design, gives North Korea the capability to develop either a submarine or ship-mounted ballistic missile. Many experts postulate that North Korea does not have the capability to develop a new SLBM on its own and that none of North Korea's other ballistic missiles are easily convertible to SLBMs. North Korea apparently integrated the Golf-IIs missile stabilization and launch technology into a new class of conventionally powered ballistic missile submarines, possibly modified versions of Golf-IIs or Romeo class Russian submarines. It is also possible, according to some observers, that North Korea might attempt to incorporate this launch technology into a merchant ship. It is not known if North Korea has sold or will sell this new system to other countries. Some analysts suggest that Iran might be an ideal candidate for such a system, as it has allegedly researched a sea-based ballistic missile capability in the past. DPRK systems potentially increase the missile threat to the United States. If the new missiles are indeed closely modified versions of the R-27, they are likely more accurate in relative terms and have greater range than other DPRK missiles. Some analysts believe that the sea-launched version could pose the greatest threat by threatening the continental United States. These experts suggest that a North Korean sea-launched missile capability could complicate intelligence collection efforts as well as present challenges for South Korean, Japanese, and U.S. ballistic missile defense systems. Others, however, are skeptical that North Korea can reach the continental United States with the new sea-based version. Anonymous U.S. government officials reportedly stated that North Korea does not presently have a submarine that is capable of transporting a missile within striking distance of the continental United States. These officials also expressed doubt that North Korea had intentions of developing a missile to hide inside a freighter to be used against targets in the United States.

Summary: This report briefly reviews North Korea's ballistic missile program. In summer 2007, North Korea tested modern, short-range missiles. In February 2009, South Korea reported the DPRK had deployed a new intermediate-range missile. This report may be updated periodically. Additional information is provided by CRS Report RL33590, North Korea's Nuclear Weapons Development and Diplomacy, by [author name scrubbed].