Despite multiple nuclear tests carried out by Pyongyang, most South Koreans think war is unlikely.
Not even Pyongyang's sixth and largest nuclear test to date is shaking South Korea's president olive branch offer to Pyongyang.
Pyongyang routinely condemns the exercises as an example of hostility from the U.S. and its "puppet" in Seoul.
South Korea's President Moon Jae-In said the North was inching "closer to the threshold of the red line."
As President Donald Trump tries to get South Korean President Moon Jae-in on board, North Korea warns nuclear war is closer than ever.
"I believe it is quite clear that they have a heavy responsibility in the process that led to Mr. Warmbier's death," Moon Jae-in said.
Despite the South Korean president's attempts to open dialogue, the North has made several moves that raise tensions.
The warning from South Korea's new president comes despite his more diplomatic tone toward North Korea.
Moon Jae-in has set out his plan to ease tensions on the Korean peninsula.
The two leaders agreed to work toward peace on the Korean peninsula.
The election of Moon Jae-in, a dovish leader in South Korea, could complicate Donald Trump's plans to stop North Korea's nuclear weapons programs.
According to polls, liberal Moon Jae-in is likely to sweep to victory.
South Korea's probable new president is set to shake up the status quo in relations with North Korea and the United States.
If Moon Jae-in, front-runner for the May 9 election, reverses policy on the deployment of the THAAD system, it will place him at odds with the United States, South Korea's biggest ally.
He said, if elected, he would visit rival North Korea before making a trip to South Korea's main ally, the United States.