His counterparts from Seoul and Pyongyang also are in attendance and briefly spoke at a gala dinner Sunday night.
A US push to further isolate North Korea appeared to be reaping some dividends Sunday as China, Pyongyang's major benefactor, urged its outcast neighbor to make a "smart decision" and stop conducting missile launches and nuclear tests.
Ri did not respond publicly.
Early Tuesday, Trump shared a Tweet from Fox & Friends reporting that a U.S. Spy satellite photographed North Korea moving several anti-ship cruise missiles to a patrol boat. Those tests sharply escalated USA fears that Pyongyang is a key step closer to mastering the technology needed to strike American soil with a nuclear-tipped missile.
The U.N. Security Council unanimously approved new sanctions on North Korea Saturday, including banning exports worth over $1 billion.
Pyongyang also promised to continue its military build-up, despite the harsh package of restrictions on the North Korean economy that were agreed by the United Nations on Saturday. Tens of thousands of them return hard currency to the increasingly isolated regime.
That ultimatum has raised the prospect of fresh conflict on the Korean Peninsula, if the USA decides to stop Kim's nuclear program by force.
China voted in favor of sanctions that promise to cut North Korea's annual export revenue by a third, going along with the other members of the UN Security Council. As Pyongyang continues playing a reckless game, and the USA under the volatile leadership of Trump finds itself with few options in dealing with the country, China's role as an intermediary is likely to become even more important. Very big financial impact!
In addition, Beijing fears that the collapse of order in North Korea could lead to instability on the North Korea-China border, a potentially large influx of refugees that it would need to manage, and ultimately the potential emergence of a new pro-U.S. successor to Kim.
"Since past year, when it forcibly implemented two nuclear tests and more than 20 ballistic missile launches, the security threats have entered a new stage", the Japanese Defence Ministry said in the 563-page document released on Tuesday.
Bonnie Glaser, director of the China Power Project at the Centre for Strategic and International Studies in Washington, said the sanctions resolution was "a win for China", because it had avoided agreeing to oil sanctions.
United States officials say nations are responding the pressure campaign, by reducing the number North Korean guest workers and cutting flight and diplomatic missions.
North Korea has lashed out at the latest round of United Nations sanctions calling them 'a rampant violation of our sovereignty and a frontal challenge to our republic'.
But critics say tightened sanctions have done little to stop North Korea's missile and nuclear development.
Tillerson told reporters that he and Kang would be discussing the next steps to take on North Korea. "At the end of the day, it will take more than sanctions". "I don't think that the USA has a clear policy on North Korea".
Indeed, it's fair to wonder if China isn't the biggest victor in the United Nations sanctions decision. On Tuesday, Trump asserted that he will respond with "fire and fury" to North Korea, which he previously said "is behaving in a very unsafe manner, and something will have to be done about it.and probably dealt with rapidly". "They never have and likely never will". North Korea still has other weapons in the works, as the canisters for a potential solid-fueled ICBM rolled out during a military parade in April demonstrated.
"China's strategy is to ensure the status-quo hold for at least the short- to medium- term", he said.
Also on the agenda for the ASEAN meeting was an attempt to address the rising assertiveness of China in the region as Beijing continues to construct military facilities on man-made islands in the disputed waters of the South China Sea.
Tillerson is due to meet Wang and Russia's Foreign Minister Sergei Lavrov later on Sunday, seeking to intensify Kim Jong-Un's diplomatic isolation and reduce the risk of renewed conflict.
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