Well, if it is Missile defense, then I wouldnt complain about it. Of course not many people will agree with it.
When I said I dont see how it is encirclement, I meant I doubt the reasons of doing this is purely to encricle China like the OP seems to have said.
A good amount of these countries (like Poland) wanted these systems and asked for it. South Korea has it as everyone knows North Korea seems hostile. Japan has it because it is in reach of North Korea.
Any move militarily or economically can be viewed as aggressive to one's country. For example: China dumped some US bonds, not enough to do much, but some see that as aggressive.
All I am saying, I dont think and we all dont have proof if this is done specifically to encircle China. I believe this is done to persaude North Korea to stop its nuclear tests, therefore encircling North Korea.