The United States is imposing a series of new sanctions against North Korea.
The BBC reports President Barack Obama will sign an executive order on Monday mandating new financial sanctions.
The sanctions will hit eight North Korean "entities" and four individuals, targeting the trade in arms, luxury goods and narcotics.
The new sanctions come after the sinking of a South Korean warship in March, in which 46 sailors died.
North Korea has denied responsibility for the sinking.
Secretary of State Hillary Clinton announced last month that US sanctions against North Korea would be expanded.
North Korea has been seeking nuclear weapons for some years and carried out its second nuclear test last year, prompting international condemnation.
North Korea indicated last year that any attempt to blockade the country would be regarded as an "act of war".