State Department and Treasury Department officials testified to the House Foreign Affairs Committee about the US pressure campaign against North Korea's rapid progress toward a nuclear weapon that could strike America.
The hearing came a day after the UN Security Council imposed its latest sanctions over what North Korea says was a hydrogen bomb test Sept. 3, its most powerful atomic test yet.
The council banned North Korean textile exports, an important source of hard currency, and capped its imports of crude oil.
Treasury Assistant Secretary for Terrorist Financing Marshall Billingslea credited China and Russia's support of the UN resolution but said both countries "must do much more" to implement and enforce the sanctions, in the face of Pyongyang's ability to evade restrictions that have been progressively tightened for a decade.
"Because of uneven, and sometimes nonexistent, international implementation, North Korea shrugs off the practical impact of many restrictions, and is still exporting prohibited goods such as weapons, minerals, and statues," Billingslea said.
Susan Thornton, the acting top US diplomat for East Asia, noted that last month the US rolled out new sanctions targeting Russian and Chinese individuals and entities.
She said the US would continue to act to disrupt North Korea's illicit activities wherever they are located.
That included a June 29 designation of the Bank of Dandong, a regional Chinese bank, which is believed to help North Korea access the US and international financial systems.
Thornton said the administration "has made clear that if China and Russia do not act, we will use the tools we have at our disposal."
Republican Rep. Ed Royce, the committee chairman, said efforts by the US and its allies to counter the threat from North Korea nuclear and missile programs should be "super- charged."
He said the North's access to hard currency was its "Achilles heel." He urged the administration to "dramatically ramp up" US sanctions designations of entities that deal with North Korea, particularly Chinese banks. He singled out the China Merchants Bank and the Agricultural Bank of China.
Rep. Eliot Engel, the committee's top-ranking Democrat, supported the pressure campaign but strongly criticized President Donald Trump's commentary on the North Korean crisis, which he said was making matters worse.
He cited Trump's warning last month of "fire and fury" against the North if it makes more threats, and his "shaming" of allies through tweets, which he said undermined US credibility.
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