days. china has accused the united states frf starting the quote, biggest trade war in economic history as $34 billion in u.s. tariffs on chinese goods now goes into effect. beijing says it has no choice but to strike back. the top u.s. diplomat is in pyeongyang for nuclear talks with north korea. mike pompeo is under pressure, though, to deliver results after the lofty promises of denuclearization from that summit that took place in singapore. pyeongyang has yet, though, to provide any firm details or even a time line on how it plans to get rid of its nuclear programs. recent reports suggest north korea has no intention of giving up its nuclear weapons. cnn s barbara starr has a look at what s at stake for this trip. reporter: secretary of state mike pompeo under tremendous pressure to get north korea to