Asean rises as an important strategic partner to South Korea amidst President Moon's efforts to strengthen tie.
South Korea will likely deploy four additional Thaad launchers as early as next week, according to anonymous South Korean and US military personnel.
North Korea fires a ballistic missile which flies over the Japanese island of Hokkaido before landing in the Pacific Ocean, prompting residents to seek shelter and calls for additional actions against the reclusive state.
The US and South Korea have begun their annual 11-day joint military drills, despite weeks of escalating threats from North Korea.
Beijing renewed its protest after Seoul decided to install four Thaad launchers, which had been initially deferred due to an environmental review, in response to Pyongyang's latest test of an intercontinental ballistic missile last month.
North Korean leader Kim Jong-un said he would watch the conduct of the US "a little more" before deciding whether to order the firings, Pyongyang's state-run Korean Central News Agency reported Tuesday.
North Korean leader makes the remark during an inspection of the Strategic Force Command of the Korean People's Army.
Rather than taking any rash military actions, South Korean President Moon Jae-in vowed to take a more peaceful approach to North Korean provocations.
A targeted strike or even inadvertent escalation from the US could trigger retaliation, with potentially devastating consequences for South Korea.
McDonald's South Korea says the consumer group's analysis is invalid because it did not follow proper procedures.