SEOUL—Chinese and Russian warplanes have increasingly nosed around and veered into South Korea’s airspace, conducting close patrols that allow Beijing and Moscow to test the air defenses of the U.S. and its allies in the region.
Wall Street Journal: Chinese, Russian warplanes test US patience in skies near South Korea
A Chinese J-20 stealth fighter performs at the Airshow China 2018 in Zhuhai in southern China's Guangdong province on Nov. 6, 2018.
