North Korea has vowed to retaliate and make "the US pay a price" for drafting fresh UN sanctions over its banned nuclear weapons programme.
The sanctions, which were unanimously passed by the UN on Saturday, were a "violent violation of our sovereignty.
Separately, South Korea says the North has rejected an offer to restart talks, dismissing it as insincere.
The sanctions will aim to reduce North Korea's export revenues by a third.
The UN Security Council decision followed repeated missile tests by the North which have escalated tensions on the peninsula.
What are the new sanctions?
- Importing coal, seafood, iron and iron ore, lead and lead ore from North Korea is banned
- Countries cannot receive new North Korean workers
- No new joint ventures with North Korean entities or individuals
- No new investment in existing joint ventures
- More individuals targeted with travel bans and assets freezes
- Member states to report to the UN Security Council within 90 days on how they have implemented resolution