@areal
I believe nine dot map is seen by USA as a big challenge made by China right into the face of USA hegemony. USA is concern that the vital shipping route which is very important in Asia Pacific region will be under 100 % China influence (based on China map). And we know that 21 century is an Asian Century.
Actually, there is no economical gain if China take it through force since Ukraine scenario will be imposed by USA directly. It will just attack China economy badly considering all NATO nations will be in his side. It is better for China to compete USA in economic and technology term, and dont be foolish to follow Russia footstep.
It is a sincere advice for me to all of Chinese here to avoid any problem during our Asian rise century. Furthermore, as Indonesian, we dont really have any problem on China rise. We have already been cooperating with them since hundreds years ago, in which we had two big empire at that time which were Srivijaya and Majapahit, even Majapahit Empire is wider than current Indonesian region. We only had a war with China when China was still under Mongol, and we know Mongol people are aggressive one, once they had really powerful power.