Chinese state media yesterday said that the U.S. needs to rein in its "moral arrogance" over North Korea following the measures.
The Pentagon said it had received the request to review the guidelines from South Korea and the military was working with the State Department to determine the best way forward.
U.S. Secretary of State Rex Tillerson, who is attending the forum, skipped the gala dinner where the two ministers spoke but is expected along with the 24 other top diplomats from region to be in the same room as North Korea's representative at a session later Monday.
According to Fox News, diplomatic sources said Sunday that Washington had hoped the region's countries, including members of the Association of Southeast Asian Nations (ASEAN), would issue a joint communiqué after their annual gathering in Manila.
Kang was said to have explained to Wang that Moon's decision to deploy four more Thaad launchers was a "defensive measure" in the face of North Korea's missile threats.
Wang's meeting with North Korea's Ri started off cordially, with Ri smiling as the two shook hands.
The obstacle came one day after the U.N. Security Council on Saturday unanimously approved new sanctions against North Korea in the wake of the communist nation's first successful tests of ICBMs capable of reaching the US mainland.
According to the official, Kang pointed out to Ri that North Korea has yet to give any response to South Korea on its offer to hold bilateral talks, and urged Pyongyang to positively respond soon.
At ASEAN Regional Forum, Kang Kyung-wha reiterated proposals for military and Red Cross talks The South and North Korean Foreign Ministers had a chilly first meeting on the evening of August 6 while in Manila for the 24th ASEAN Regional Forum (ARF).
During a brief discussion with Russia's Foreign Minister Sergey Lavrov on Sunday evening, Kang asked for Moscow to play a "constructive role" in stopping North Korea's military provocations.
"The Chinese side urged the North Korean side to calmly handle the resolutions. and to not do anything unbeneficial towards the worldwide community such as a nuclear test", Wang said.
The communiques also says that the ASEAM foreign ministers plan to "to further strengthen our cooperation in countering terrorism and combating violent extremism".
Ri said Pyongyang will only train its rockets on other countries if these participate in the US military action against North Korea.
Moon told Trump the South "cannot let another war to break out" on the peninsula after the 1950-53 Korean War that sealed the division of two Koreas, the presidential Blue House said in a statement.
It bans North Korean exports of coal, iron, iron ore, lead, lead ore and seafood and prohibits countries from hiring additional North Korean labourers.