North Korea vows harsh retaliation against new UN sanctions

By HYUNG-JIN KIM
SEOUL, South Korea  — North Korea vowed Monday to bolster its nuclear arsenal and launch “thousands-fold” revenge against the United States in response to tough U.N. sanctions imposed after its recent intercontinental ballistic missile launches.
The warning came two days after the U.N. Security Council unanimously approved new sanctions to punish North Korea, including a ban on coal and other exports worth over $1 billion. The U.S. ambassador to the U.N.,