China's natural disaster administration has said it had detected a magnitude 3.4 quake in North Korea that was a "suspected explosion", raising fears the isolated state had conducted another nuclear bomb test.
"The exchange of threats is quite bad, unacceptable", Sergei Lavrov told reporters at a news conference".
North Korea's weakest nuclear test, the first one conducted in 2006, generated a magnitude 4.3 quake.
China will also ban textile imports from the North, the ministry said.
The USGS also said it occurred in the nuclear test area but said its seismologists assessed it as having a depth of 5km.
The volley of insults continued on Friday as Mr Trump sent out a pre-dawn Twitter post: "Kim Jong Un of North Korea, who is obviously a madman who doesn't mind starving or killing his people, will be tested like never before!" the president tweeted.More news: Bengal panel to bat for Rohingyas in Supreme Court
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The North, which says it needs nuclear weapons to protect itself against the threat of invasion by a hostile United States, responded on Friday with a rare personal rebuke from Kim, who called Trump "mentally deranged" and a "dotard" and threatened the "highest level of hard-line countermeasure in history".
Trump stopped short of going after North Korea's biggest trading partner, China, and praised its central bank for ordering Chinese banks to stop doing business with North Korea.
European Union ambassadors have reached an initial agreement to impose more economic sanctions on North Korea, going beyond the latest round of United Nations measures, officials and diplomats said.
Tensions between the United States and North Korea have ratcheted up after Pyongyang conducted its sixth and most powerful nuclear test September 3, prompting the United Nations to impose even tougher sanctions last week.
"All of our endeavors are to prevent war from breaking out and maintain peace", Moon said in his speech.
China doesn't disclose details of trade with the isolated North, so it was not immediately clear how large the possible reduction might be.
Russian Foreign Minister Sergei Lavrov condemned Pyongyang's missile and nuclear "adventures" but warned "military hysteria is not just an impasse, it's a disaster". "At this point, no matter how many sanctions are piled on, the current government of North Korea simply can not give in".