“U.S. State Department issues travel advisory for China, warning citizens to 'exercise increased caution ... due to arbitrary enforcement of local laws as well as special restrictions on dual U.S.-Chinese nationals.” Here is the full buff from the US State Department:
China Travel Advisory
Travel Advisory
January 3, 2019
China - Level 2: Exercise Increased Caution

     Exercise increased caution in China due to arbitrary enforcement of local laws as well as special restrictions on dual U.S.-Chinese nationals. Chinese authorities have asserted broad authority to prohibit U.S. citizens from leaving China by using ‘exit bans,’ sometimes keeping U.S. citizens in China for years. China uses exit bans coercively:

•    to compel U.S. citizens to participate in Chinese government investigations,
•    to lure individuals back to China from abroad, and
•    to aid Chinese authorities in resolving civil disputes in favor of Chinese parties.

     In most cases, U.S. citizens only become aware of the exit ban when they attempt to depart China, and there is no method to find out how long the ban may continue. U.S. citizens under exit bans have been harassed and threatened. U.S. citizens may be detained without access to U.S. consular services or information about their alleged crime. U.S. citizens may be subjected to prolonged interrogations and extended detention for reasons related to “state security.” Security personnel may detain and/or deport U.S. citizens for sending private electronic messages critical of the Chinese government. Extra security measures, such as security checks and increased levels of police presence, are common in the Xinjiang Uighur and Tibet Autonomous Regions. Authorities may impose curfews and travel restrictions on short notice. China does not recognize dual nationality. U.S.-Chinese citizens and U.S. citizens of Chinese heritage may be subject to additional scrutiny and harassment, and China may prevent the U.S. Embassy from providing consular services. Read the Safety and Security section on the country information page. If you decide to travel to China:

•    Enter China on your U.S. passport with a valid Chinese visa and keep it with you.
•    If you are arrested or detained, ask police or prison officials to notify the U.S. Embassy or the nearest consulate immediately.
•    If you plan to enter North Korea, read the North Korea Travel Advisory.
•    Enroll in the Smart Traveler Enrollment Program (STEP) to receive Alerts and make it easier to locate you in an emergency.
•    Follow the Department of State on Facebook and Twitter. Follow the U.S. Embassy on Twitter, WeChat, and Weibo.
•    Review the Crime and Safety Reports for China.
•    U.S. citizens who travel abroad should always have a contingency plan for emergency situations. Review the Traveler’s Checklist.”

     Now I expect that many readers will anticipate my response which could be shock! horror! Chinese totalitarianism! But really, the Chinese operate on principles of racial loyalty that have been beaten out of the West. The idea of dual citizenship makes no sense at all to the Chinese communist leadership, who, as illustrated by the classic example of Taiwan, see all Han Chinese as part of the motherland. Is this wrong? Yes, it is tribalism, and yet some part of us which has not been soiled and abused by the forces of modernity sees this as sane and right. So, as I have said in previous articles, while I am deeply concerned about China’s rise to power, I still respect the Chinese for resisting the forces of deracination which have almost destroyed the Nordic (Northern European) people and gene pool.

     There is a small chance, that when the West falls the Chinese may be able to preserve the best of Western civilisation, but I would not hold my breathe. In any case, if we are to be a part of Asia, then let us adopt these Chinese values!