The author of "Crashback", Michael Fabey, is a long time reporter on military and naval affairs. His book details China's expansionist policy in the South China Sea, muscling into the area and taking over a number of small islands and reefs, many of which are claimed by other regional nations as well as by China. Expanding its borders in this way gives China further reach and strength militarily, and by claiming territory in dispute, gives it economic strength by claiming mineral rights and fishing rights in those areas. Smaller nations such Vietnam or the Philippines can't compete with China economically or militarily, and China is moving ahead with it's policies despite international objections. By expanding its borders in this way, China also makes territorial claims around these islands, redefining international waters recognized by the rest of the world to territorial waters claimed by themselves. This change in territorial water status would prevent other nations, and other navies, from navigating through these waters without permission.
Only the U.S. has the military strength in the region to stand up to the Chinese, however as Fabey points out with examples of past confrontations, the U.S. has not been willing to push back very forcibly, and China seems to be winning in this "warm" war with the U.S. One specific example, from which the book takes its name, details an attempt by a U.S. Navy guided missile cruiser, the U.S.S. Cowpens, in International waters by world-wide definition (but in territorial waters by Chinese definition), sailed in the vicinity of China's new aircraft carrier. Chinese naval forces ordered the Cowpens to leave the area, and when the Cowpens failed to comply, dangerously blockaded the Cowpens by positioning ships in a collision path with the U.S. vessel. This caused the Cowpens to implement an emergency stop, i.e., go to "Crashback" mode, to avoid colliding with the Chinese warship and causing an international incident.
Faber shows how China continues to flex its muscles in the region, and as its naval forces grow and weapon capabilities expand, it's becoming even bolder in its stance in the South China Seas.
The author also describes the rapid improvement in Chinese naval and weapon capabilities. Many of the U.S. Navy ships have older missile technology, and newer Chinese defensive and offensive missiles are rapidly improving, and have far greater range than many U.S. vessels. Faber's message seems to be that China's strength is growing rapidly, and if international order and rules are to be maintained in the South China Sea region, and if it's in the U.S. national interest to preserve that order and those rules, then the U.S. needs to focus and address this change in status quo.
Without stating so specifically, Fabey seems to be somewhat critical of the Obama Administration's handling of the expansionist aims of China in the region over the past several years, and I suspect is more hopeful that the Trump Administration will take a more forceful approach in the area in order to maintain America's and their allies interests in the region. President Trump's recent National Security speech seems to answer Faber's concerns. The President has stated that the United States has to “rethink the policies of the past two decades — policies based on the assumption that engagement with rivals and their inclusion in international institutions and global commerce would turn them into benign actors and trustworthy partners.” According to the President, that isn't happening, as evidenced by Russia's interventions in Ukraine and Georgia, and China's claims to the South China Sea at the expense of their neighbors.
The President has called for an increase in the Defense Department budget and military spending, something Faber should find worthwhile, but there remains the question as to whether the plan to strengthen the Navy will be to build "more" vs. building "smarter". Based on Faber's book "Crashback", I suspect the author would prefer additional emphasis on the latter approach. Continuing to spend without a modern real-world strategy could simply widen the gap with China, something this book points out to be a dangerous approach.