President Donald Trump has nominated career foreign service officer Susan Thornton as top U.S. diplomat for East Asia, the White House said Tuesday, as a step to build a full-fledged team to tackle North Korea's escalating nuclear threat.Thornton is expected to handle relations with Japan, China, South Korea and other Asian countries as the assistant secretary of state for East Asian and Pacific affairs. The post has been vacant since the departure of Daniel Russel, who served under the administration of Trump's predecessor Barack Obama.The U.S. government is also set to nominate Victor Cha…READ FULL ARTICLE