China accounts for the vast majority of North Korea's trade. President Trump has accused China of not doing enough to push back North Korea's nuclear program.
It is the latest in a tit-for-tat between President Trump and the North Korean leader. In a tweet on Friday, the president said Kim Jong Un "will be tested as never before!"
In an extraordinary statement released through state media, the North Korean leader says the U.S. president is "surely a rogue and a gangster fond of playing with fire, rather than a politician."
In this first address to the United Nations General Assembly, President Trump took on the global threats posed by North Korea and Iran and reiterated his "America First" approach to policy.
A recent tweet by President Trump about long gas lines in North Korea reopens questions about what's going on in the country's opaque economy after several rounds of economic sanctions.
In addition, most falsely believe the president needs congressional authorization to launch a nuclear strike. North Korea's renegade program will be a major focus at this week's U.N. General Assembly.
Sanctions and the threat of military action have proven ineffective at stopping North Korea's nuclear program. Some say that a deal with North Korea, with China's involvement, may be the way to go.
As President Trump tweeted, Ambassador Nikki Haley talked tougher Sunday. "We're trying every other possibility that we have," she said, "but there's a whole lot of military options on the table."
South Korean and Japanese officials say the latest missile flew over Hokkaido and fell into the ocean, and the South Korean military conducted a live-fire ballistic missile drill in response.