The United States on Monday flatly rejected a proposal from China and Russia on how to lower tensions on the Korean Peninsula, which is likely to make it difficult for the United Nations Security Council to agree on a response to North Korea’s hydrogen bomb test over the weekend.

U.S. Ambassador to the U.N. Nikki Haley said the U.S. would be circulating a proposed resolution on North Korea this week, and would push for a vote next week.