; (4) to encourage all countries to fully implement and enforce United Nations sanctions commitments with respect to North Korea, including ending the practice of hosting overseas North Korean workers; (5) to increase the effectiveness of United States sanctions by seeking to work through the United Nations and with other like-minded countries to ensure a multilateral approach to sanctions; (6) to provide unmistakable assurance to Japan and South Korea that the United States is committed to fulfilling its treaty obligations if they are attacked; (7) to provide support for North Korean refugees and asylum seekers in accordance with United States and international law; (8) to promote the human rights and dignity of the North Korean people, including through the United Nations and other multilateral institutions; and (9) to seek opportunities for humanitarian actions, such as family reunification and the return of human remains of United States servicemembers missing in action and killed in action on the Korean Peninsula. (c) Economic pressure It is the policy of the United States to sustain and calibrate economic pressure on North Korea until North Korea undertakes meaningful and verifiable actions toward denuclearization, including by— (1) encouraging all countries to implement and enforce existing United Nations sanctions; (2) leveraging the strength of the United States financial system to deny access by the Government of North Korea and those with whom such government facilitates illicit financial transactions to the United States and global markets, including through the use of secondary sanctions; (3) encouraging all countries, in accordance with United Nations Security Council resolutions, to end the practice of hosting North Koreans as guest workers, recognizing that such workers are demonstrated to constitute an illicit source of revenue for the Government of North Korea and its nuclear program