It also comes at a potentially embarrassing time for North Korea's only real ally, China, which iscurrently hosting the Group of Nations summit in Hangzhou.
At the G20, Chinese President Xi Jinping told his South Korean counterpart on Monday that Beijing opposes the deployment of the United States'
THAAD missile defense systemto South Korea, according to China's official Xinhua News Agency.
"Mishandling the issue is not conducive to strategic stability in the region and could intensify disputes," Xinhua quoted Xi as telling Park Geun-hye.
The stated purpose of the THAAD system is to defend South Korea from missile attack from the North.
CNN's Pamela Boykoff contributed reporting from Hangzhou, China.
North Korea fires three ballistic missiles; China opposes THAAD
It also comes at a potentially embarrassing time for North Korea's only real ally, China, which iscurrently hosting the Group of Nations summit in Hangzhou.