"This is a chance to see if he can open things up," he said. "The relationship has been so frosty, it will be interesting to see if there's some improvement in the bilateral ties."
China sending envoy to North Korea following Trump visit →
"The North Koreans have always driven China crazy," says John Delury, an expert on both countries at Seoul's Yonsei University, "and, for their part, the North Koreans have always felt betrayed by China.
Chinese power over North Korea? It's more myth than reality →