The U.N. Security Council is expected to vote on a resolution imposing new restrictions on North Korea on Monday afternoon.
North Korea "will keep watching every move of the U.S," after Nikki Haley's "tongue-lashing."
Newsweek takes a closer look at North Korea's missile development program.
The regime is about to celebrate its 69th year of existence as the Democratic People's Republic of Korea, and the South is on high alert for a possible missile test.
Despite multiple nuclear tests carried out by Pyongyang, most South Koreans think war is unlikely.
Chinese soldiers were rushed to the country's northeastern coast to fire missiles and machine guns designed to blast enemy planes out of the air.
While estimates vary, experts say the latest North Korean nuclear test may have produced an explosion nearly 10 times stronger than the Hiroshima bombing.
"The stronger and the smarter one will show restraint," Russia's deputy foreign minister said.
Pyongyang's official news agency also likened South Korea's defense minister to Trump's dog.
Kim Jong Un and his progenitors have always relied on unpredictability as their main diplomatic and political tactic. Has North Korea met its match with Donald Trump?
Experts at a Washington-based North Korean monitoring project estimated that the country could have as many as 20 nuclear bombs.
After North Korea's successful test this week, the answer isn't particularly reassuring.
Experts suggest North Korea's latest missile could reach U.S. territory in the Pacific.
North Korea remained defiant and vowed to continue with nuclear and missile tests.
Pyongyang's nuclear facilities must be properly monitored, rather than kept hidden.
North Korean leader Kim Jong Un said that the isolated, nuclear-capable country was close to test-launching an intercontinental ballistic missile (ICBM).
Pyongyang's main newspaper said Barack Obama's "strategic patience" had not paid off.