When exactly did China expressed the 9 dash translates to "national soil"? Countless commercial ships traverse those waters every day. I tend to think the "national soil" take is really more of what is projected by the other claimants to generate a fear factor and hype up the China threat. If you exclude the fight over the islands themselves and the fishing rights associated with them, there's zero impact to the rest of the world. Hype up the threat that China's gonna close off those waters as "national soil" and all of a sudden, this is an "issue" the rest of the world needs to be involved in per some of these other claimants.
It's clearly about the resource beneath the surface of the sea...the energy resources.
By making the claims they do, the PRC is basically laying claim to the bulk of those resources...and everyone knows it.
It's why they are aggressively putting oil rigs out there, and why they are aggressively reclaiming land on numerous islands...and I bet the number will grow.
At the same time, Malaysia, the Philippines, Vietnam, etc. all want to access to as many of those resources as they possibly can. But they are not strong enough to assert their claims the way China can now assert hers.
it is really as simple as that.
By claiming the whole of the South China Sea...even if they say it is just the islands...they are in reality making a play for those resources and they are going about, with a will, establishing dominance in the region to do so.
That's what is really afoot...and the PRC is playing it for the long haul.
...and with the likes of Obama otherwise engaged...or, more precisely, not engaged, there is no real effort to challenge it, except for a few skirmishes here and there by demonstrably weaker nations.
Do not get me wrong. I do not believe China would go to war with the US if the US were to challenge her. The PRC, IMHO, would simply continue to make the claim. Continue to increase holdings and reclamation, and continue to put rigs out there wherever they can. They are playing for the long haul.
Unless equal measures were made by those other nations...with strong help...to also increase holdings, reclaim reefs and shoals, place rigs, etc., well, over time, the steady increase of the PRC's holdings will make their case a de facto reality without having to have any open conflict.
The only real way to counter it is for the others to do likewise and try and keep abreast so the actual amount of holdings stays on par. In the current environment...I do not see that happening..