Produces plenty of thrust when it self detonates. The country that manufactured the most successful rocket engine in history, the Saturn 5 has been reduced to using soviet era rocket engines, Kruschev was right, and the mighty have fallen. We took ourselves out.
Supposedly the Russians innovated in ways our engineers deemed impossible. It does not matter that they were slaves of the state, they gambled in terms of design and it paid off. The previous three sets of engines for the rocket have already performed well.