Russia and China have taken a lead over the U.S. with hypersonic missiles and now threaten not on the U.S. mainland but also significant assets like its aircraft carriers. The U.S. is now in a race to catch up, not only with its own hypersonic missiles but also a method to try and stop the so-called unstoppable missiles. So in this video, we look at how they could do this and some of the problems that the use of hypersonic missiles presents.