It claimed the sanctions were caused by a "heinous USA plot to isolate and stifle" North Korea and said the country will take "action of justice", but did not elaborate.
China will pay the biggest price from the new United Nations sanctions against North Korea because of its close economic relationship with the country, but will always enforce the resolutions, Chinese Foreign Minister Wang Yi said.
"We will, under no circumstances, put the nuclear and ballistic missiles on the negotiating table", Ri said in the statement released to reporters at the conference.
"We will make the USA pay by a thousand-fold for all the heinous crimes it commits against the state and people of this country", the statement said.
North Korea announced the plans following U.S. President Donald Trump's comments on Tuesday that any threats by Pyongyang would be "met with fire and fury like the world has never seen", remarks that KCNA called "a load of nonsense".
The leader of the country, Kim Jong-un, has promised to continue the tests, drawing condemnation from South Korea, Japan and the United States.
"Watching them go frantic only redoubles the DPRK's pride in the country's great might and reaffirms its faith that the path it had chosen is the only way to survive and prosper", the mission's statement said. China alone is responsible for 90 percent of North Korea's trade.More news: Dow plummets 205pts as Trump inflames Korea tension
In the context of North Korea's rapidly advancing intercontinental ballistic missile program, these threats can not be ignored.
Ahead of the gathering, the United States had urged ASEAN countries to "downgrade" its North Korea ties.
"North Korea should realise if it doesn't stop its nuclear, missile provocations, it will face even stronger pressure and sanctions", Defence Ministry spokesman Moon Sang-gyun told a regular news briefing.
"The sanctions bill which went through the United Nations recently didn't target Chinese entities directly. they'll actually be relieved they're not being directly targeted by the U.S.as many have feared", he said.
The sanctions will ban North Korean exports of coal, iron, iron ore, lead, lead ore and seafood and prohibit countries from hiring additional North Korean labourers.
The UN Security Council on Saturday imposed its toughest round of sanctions yet against Pyongyang over its two intercontinental ballistic missile (ICBM) tests in July.
At the same time, Washington has issued blunt warnings that the United States will use military force if necessary, and North Korea has answered in kind.
On Monday, Trump complained that the US -led sanctions vote at the United Nations is not getting enough attention, writing, "The Fake News Media will not talk about the importance of the United Nations Security Council's 15-0 vote in favor of sanctions on N. Korea!"More news: North Korea threatening missile strike on Guam, report says
Mr Trump expressed his satisfaction in a Tweet after he spoke with the president of South Korea about the "grave and growing" threat of North Korea, the White House said. But, he added, "this is not a 'Give me 30 days and we are ready to talk.' It's not quite that simple".
"We'll know it when we see it. ..."
But Washington says it will be watching closely to ensure that China doesn't ease up on the North - if and when the world's attention is diverted elsewhere.
"China has been very secretive about North Korea so it's hard to tell, hard to find those signs", he said. While China agrees with sanctions on the North, Wang, the Chinese Foreign Minister, said Sunday that they should be aimed at forcing Pyongyang to return to negotiations directed at taming its nuclear ambitions.
During the previous administration, the Philippines clashed with Beijing and its Aseab allies over China's massive reclamation activities in the South China Sea, which falls within the Philippines' exclusive economic zone in the West Philippine Sea.
John Delury, a China and North Korea expert at Yonsei University in Seoul, noted that the Chinese population that lives along the 800-mile border with North Korea is already struggling financially.
But North Korea is not in a conciliatory mood. China alone is responsible for 90 percent of North Korea's trade, and Russian Federation like China employs North Koreans as contract workers, whose salaries mostly go directly to their government.More news: Sharad Yadav removed as leader of JD(U) in Rajya Sabha
- Chelsea Must Do This To Hope To Defend Title - Alan Shearer
- Haryana stalking case: Vikas Barala sent to judicial custody till August 25
- China slams US Navy's new 'provocation' in South China Sea
- Guardiola unmoved by Manchester City favourite tag
- Phoenix Suns reveal new Nike uniforms
- Futures lower as N.Korea tensions extend to third day
- Guardiola admits double injury blow ahead of Brighton clash
- 'Brangelina' still sailing through! Angelina Jolie calls off divorce from Brad Pitt
- National 811 Day reminds people to call before digging
- Hundreds honor Justine Damond at memorial