Obviously, this person knows nothing astronautics, and significantly weak in common logic. I can imagine why some people especially chinese 愤青 act like getting orgasm just mention the word 变轨. They made 变轨 sounded like some mythical technology.

10 years ago, when I set in the satellite control room, supporting orbit transfer for 5 satellites, and it wasn't that mythical. ICBM don't need this so call orbit transfer. I remember someone mentioned that ICBM or Space Vehicle had been using vector thrusting. That is bs. SVs change orbits by simply making its thrust burn, which changes the kinetic energy of SVs into potential energy, the orbits. SVs don't fly like aircrafts, their maneuver relies less on aerodynamics like aircrafts. All turning requires centripital force. Aircrafts turns rely on the turning the combined forces of gravity and lift, which comes from the interaction between airfoils and air. However, there is no air in the orbit, the only centripetal force acts on LEO SVs is the gravitational force, which means the SVs cannot turn like aircraft. The orbit changes mostly is changing the altitudes. That means for ICBMs, they have to change yet another time, otherwise, they will miss the reentry points, and won't be able to reach the target. Besides, ICBMs can be well tracked by radar, and gives the ABM enough lock on it, since chaning orbits actually slows down the linear vilocity of the ICBMs. Also, if your ICBMs can change orbits, so can the interceptors. Currently the NMD C1 phase is to use 100 interceptors to counter 10 warheads.

Anyway, it will be waste of my time to teach this guy about astronautics, the bottom-line is a ICBM doesn't need to change orbits, it only slows it down. ICBM counters ABM by using decoys and that is it.