Kim Jong-un's regime gave South Korea 48 hours to stop broadcasting anti-North loudspeaker messages across the demilitarized zone.
In a letter to Prime Minister Shinzo Abe, 187 scholars say Japan's wartime history has become 'distorted by nationalist invective' at a time of growing regional tensions.
The sinking of the Sewol ferry a year ago was the worst peacetime civil disaster in South Korean history. Families of the missing and dead remain aggrieved over the handling of the rescue operation.
A dispute over possible deployment has brought sharp words between Seoul and Beijing. Foreign ministers of S. Korea, China, and Japan will meet for the first time in three years Saturday amid tensions over security, territory, and wartime history.
North Korea's state media praised the knife attack and said it showed anti-US sentiment in South Korea. Ambassador Mark Lippert is recovering after surgery on his face and hand.