The United States imposed new sanctions on six North Korean individuals and two entities that generate revenue and facilitate financial transactions for the authoritarian regime’s illicit weapons program, the Treasury Department announced.

The action targets agents of North Korean banks as well as companies that employ North Korean IT workers abroad, the department said in a statement Wednesday.

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South Korea also sanctioned four of the individuals and the two entities, its Foreign Ministry announced Thursday.

“Today’s joint action reflects our commitment to disrupt the DPRK’s efforts to generate revenue for its illicit and destabilizing activities,” Brian Nelson, under secretary of the Treasury for Terrorism and Financial Intelligence, said. “The United States, along with our South Korean partners, will continue to take action to safeguard the international financial system and prevent the DPRK from funding its illegal weapons programs.”

The new sanctions come amid growing evidence that North Korea has been able to evade a U.N. Security Council resolution that restricts its oil imports, thanks in large part to its growing relationship with Russia.