The U.S. has reiterated that China should do more to implement economic sanctions on North Korea to make the denuclearization talks more productive.<br />Assistant Secretary of Defense for Indo-Pacific Security Affairs Randall Schriver said this at a security forum in Washington on Monday,... adding that there's been some slippage in sanctions enforcement.<br />Schriver said the U.S. is willing to work with China to strengthen those enforcement efforts.<br />He also touched on Seoul's decision to end its military information sharing pact with Tokyo,... saying that the tensions between Washington's allies will only benefit North Korea, China and Russia.<br />Schriver said the tensions are spilling into trilateral security work in an unhelpful way, but security interests will ultimately bring the three back together.<br />