SEOUL—When the North and South Korean leaders vowed on April 27 to cease all hostile acts against each other, many saw it as a turning point in cross-border relations and a step toward a new era of peace. In the weeks since their historic agreement, the North ramped up its campaign of cyberattacks on South Korea, launching fresh assaults on financial companies and groups focused on North Korea, according to people familiar with the matter. The frequency of those attacks also increased this month, one of the people said.

Source: Wall Street Journal May 25, 2018 08:57 UTC