It comes after Pyongyang released propaganda images showing Kim galloping on horseback through snowy mountains on his way up to Mount Paektu.
Harsh words follow Bolton's criticism of Pyongyang missile tests.
President Donald Trump appeared to criticize South Korea during a Florida rally shortly before North Korea launched two more missiles.
"It's not going to be like toppling Hussein," the retired general said.
"I don't see the opportunities to solve this diplomatically at this particular point," Mullen said.
Missiles that F-35 stealth fighters already carry need only slight tweaks to be able to target ICBMs, an aerial combat expert says.
Ri recently appeared with Kim on a happy tour of a cosmetics factory in Pyongyang.
Russia says the world needs open dialog rather than talking about talking.
"We're ready to talk any time they'd like to talk," Tillerson said.
Japan said Moscow had "big clout" with North Korea and asked Russia to cooperate.
North Korea expressed "firm support and solidarity for Palestinians and Arab peoples struggling to win their legitimate rights."
U.S. intelligence also had advance knowledge about North Korea's previous two missile launches.
The drill in Japan took place two days after North Korea's latest missile launch.
"North Korea tests its missiles when it's ready to," a researcher said.
Leaflets from North Korea typically contain anti-American content but the latest wave are aimed specifically at Trump
North Korea has tested several ballistic missiles that landed off Japan's coast this year.
This year, the country has carried out 10 missile tests troubling neighboring countries.
As the North Korea launched a new missile test Sunday, Newsweek answers the key questions about the regime's military actions.
Sunday's test was detected by the U.S.-developed THAAD anti-missile system, despite much controversy surrounding its installation last month.