Chinese militaristic talk of sinking two American aircraft carriers is just bluster. China does not want war with the US... They might flex their muscles tho. To my thinking the answer to a Chinese attempt at a hegemony in the South China Sea is to sail allied naval convoys (US, Brit, Aus, Japan, etc.) through there - repeatedly.
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Bluster that reveals what they would really like to do, if they thought they could get away with it. Bluster and Jokes are like that-revealing of inner motivations.
Still whatever plans they may have had, the planes in Hawaii on 24/7 watch should cool their jets.
Sometimes Chinese pride clouds or nukes their often wise judgment.
Aren't the B2's usually based on Guam for Asian missions? Is Guam in danger of tipping over?