North Korea’s latest launch of their most sophisticated and far-reaching intercontinental ballistic missile to date, the “Hwasong-15”, has the world on edge. And for good reason; the pace of Pyongyang’s delivery system and corresponding nuclear warhead materials development has surprised many experts. But it’s too early to panic. We’re not in a nuclear crisis with North Korea—yet—and may not be for some time to come.
On the surface, the situation certainly seems dire. North Korea is much further along in its program than U.S. and allied analysts would have predicted. The Johns Hopkins School of Advanced International Studies project, 38 North , recently reported the Hwasong-15, “could deliver a moderately-sized nuclear weapon to any city on the U.S. mainland.” The missile is big by any standard and certainly bigger than anything the DPRK has ever launched before.
Recommended: Stealth vs. North Korea’s Air Defenses: Who Wins?
Moreover, analysts have also identified what they believe is a significantly more efficient steering mechanism on the first stage of this two-stage rocket. This new rocket could soon be coupled to a nuclear weapon. The Washington Post reported in August 2017 that the Defense Intelligence Agency had conducted analysis that year which showed North Korea had indeed achieved miniaturization of a nuclear warhead small enough to be deployed atop one of its ICBMs. Senior U.S. officials are understandably concerned. Gen. Robin Rand, the commander of Air Force Global Strike Command, when asked how far off U.S. estimates are of North Korean missile development stated, “We’ve got to get humping.”
But let’s pause here and take a collective breath. Despite these recent advances by Pyongyang, it’s vitally important to remember some of the most significant technological hurdles have yet to be cleared—putting the whole system together and making it work—when and how you want it to. This is rocket science, and it is hard.
What the DPRK does have:
1. A large, two-stage rocket that appears to have enough legs to reach any target in the continental United States
2. Some number of nuclear weapons. The exact number is debatable with expert predictions varying from fifteen bombs up to sixty bombs .
3. A number of tests, to include nuclear detonations and missile-flight tests
What the DPRK does not appear to have:
1. An ICBM with a proven track record of successful launches
2. A proven reentry system
3. A proven miniaturized nuclear warhead
4. A proven post-boost vehicle
5. A test range of sufficient length and instrumentation to simulate an intercontinental flight while tracking and measuring missile and warhead component performance
The DPRK has made great strides in missile and nuclear-weapons development. However, it’s less clear they have made similar advances in warhead miniaturization, reentry systems or missile guidance—in other words, on the components of an ICBM that are the most technologically challenging. As Terence Roehrig and I noted nearly five years ago : “All components on board must be rugged enough to survive the violent ride and the incredible amounts of shock and vibration imparted during the stage burns and get the weapon where it needs to be. Not to mention the fact that the weapon has to successfully reenter the earth’s atmosphere and be able to survive the extreme conditions subjected to it en route to its target.”
South Korea’s foreign minister agrees. Kang Kyung-wha told CNN in a recent interview, “They haven’t demonstrated their reentry capability. They haven’t demonstrated their remote targeting, or the miniaturization that is required to do this.” While Kang did admit the pace of development as worrisome, she added that “they have not reached the final completion stage yet.”
So how do the North Koreans reach this “final completion stage” and how soon can they do it? Even if we assume that North Korea can obtain all the materials required to continue missile testing and working on the reentry vehicle and warhead development, Pyongyang still needs to demonstrate the ability to pull the entire system together and make it function—reliably—from the boost phase, to stage separation, warhead separation, warhead reentry, arming and fusing and finally, to detonation. These are all complex, intricate systems that must work together with unforgivable tolerances in order to avoid complete failure. And they need a lot of testing just to ensure a modicum of reliability.
Testing, of course, brings its own unique set of problems. It does not appear that North Korea possesses a traditional flight-test range with critical tracking and instrumentation resources to sufficiently gather important data, so their scientists have a get a bit creative. Using lofted trajectories is one such method: By launching the missile on a very steep trajectory, it allows the stages to burn longer in an effort to replicate a much longer distance as well as gather data on reentry vehicle performance. While this makes it easier to determine the performance of missile stages, it’s not particularly helpful in analyzing reentry vehicle performance.