Treasury takes aim at North Korea with asset seizures

White House spokesman Jay Carney said the warning “would only increase Pyongyang's isolation.”

Treasury is trying to turn the screws on North Korea through sanctions aimed at crippling their weapons work. The actions stem from a 2005 executive order that "targets proliferators of weapons of mass destruction and their supporters."

Treasury said Tanchon Commercial Bank acts as the financial arm of Korea’s Mining Development Trading Corporation (KOMID). Bank officials Ra Ky’ong-Su and Kim Kwang-Il helped "facilitate activity" for the bank from China, the administration said.

Leader International Trading Limited, meanwhile, is accused of shipping machinery and equipment to and from KOMID officials.

“By continuing to expose these entities, and the individuals who assist them, we degrade North Korea’s ability to use the international financial system for its illicit purposes,” said David S. Cohen, the undersecretary for Terrorism and Financial Intelligence at the Treasury.

— Jeremy Herb contributed.