From trade to military tensions between the world's two superpower.
China has slammed Washington over its potential multi-billion dollar arms sale to Taiwan.
For more on this and other news from around the world, let's turn to our Hong Yoo.
Tell us more about how Beijing has reacted to the move.

Chinese Foreign Ministry Spokesman Geng Shuang said Tuesday that Beijing has filed a formal complaint with the U.S. State Department via diplomatic channels.
It calls on the U.S. to immediately cancel its proposed two-point-two billion U.S. dollar arms sale to Taiwan.
Beijing expressed its "strong dissatisfaction and resolute opposition" to the proposed sale, calling it "crude interference" in Chinese internal affairs that harmed "China's sovereignty and security interests."

"China urges the United States to honor its commitment to the one-China principle and the three China-U.S. joint communiques, immediately revoke its planned arms sales to Taiwan to avoid further damage to the China-U.S. relations and peace and stability across the Taiwan Strait."

According to the U.S. Defense Security Cooperation Agency, the proposed sale includes 108 Abrams tanks and 250 Stinger surface-to-air-missiles to help Taiwan "meet current and future regional threats" by improving the security and defensive capability of Taiwan.
The proposed sale still needs the approval of Congress but it's very likely to be given the greenlight.
Taiwan's foreign ministry said the arms sale will help boost their defensive capability.
Experts expect a strong backlash from China if the sale goes through,... further intensifying tension between the U.S. and China.