PLA's DF-21D anti-ship missile can reach Philippines: US report

[Akasa]

Sorry for being ignorant, but has the manoeuvring thing been done? It is very difficult to get to control manoeuvre at such high speeds. Also, at re-entry, generally due to heat and ionization in the vicinity, all contact is lost. So is the manoeuvring sequence pre planned? How does one communicate the change of trajectory of moving object?

The US and Russia have tested them before, so it is definitely doable.
Regarding the second question, the vehicle uses active radar guidance during, but the maneuvering is calculated and executed by the vehicle itself.

Also for the second para, I was talking about ascent, not re-entry. How does one avoid getting hit before even crossing the atmosphere?

For that to happen, the US would have to station a YAL-1 close to the coastline, where it might be vulnerable to air defenses, and it would have to know exactly when and where an ASBM will launch.