Former U.S. Diplomat Believes China Will Play Little to No Role in Trump’s Diplomatic Outreach to North Korea
I would think the only diplomacy that China would be supportive of between the U.S. and North Korea would be one that leads to the reduction or removal of U.S. troops in South Korea. If China is signaling little to no support for Trump’s diplomatic efforts with North Korea that likely means discussions about U.S. troop reductions is not being considered:

China may not block the resumption of diplomacy between the United States and North Korea but is unlikely to play a “central” role in their reengagement, a former senior U.S. diplomat said Thursday, ahead of the upcoming summit between U.S. President Donald Trump and Chinese President Xi Jinping.
Daniel Kritenbrink, who served as assistant secretary of state for East Asia and Pacific Affairs from 2021-25, made the comment in response to written questions from Yonhap News Agency, noting that Beijing will be “suspicious” of any significant thaw in the Washington-Pyongyang relations.
You can read more at the link.

