A new U.S. policy toward North Korea under the administration of President Joe Biden builds on a June 2018 agreement between his predecessor Donald Trump and North Korean leader Kim Jong Un, as well as other accords, diplomatic sources said Thursday.Japan and South Korea, two key U.S. allies in East Asia, have already been briefed on the status within the Biden administration of the agreement, in which the North committed to work toward complete denuclearization of the Korean Peninsula, the sources said.The administration, which was launched in January, has just completed its months-long po…READ FULL ARTICLE