However, China is North Korea's biggest trading partner.
US President Donald Trump extended sanctions against North Korea for one year, saying the country still posed an "extraordinary threat" despite insisting just days earlier that Pyongyang was no longer a nuclear danger to the US.
A more effective way of repatriating remains is to have a joint mission between USA researchers and the North Korean military, Downes said.
Both Kim and Xi must also have felt the need to fine-tune their positions and showcase their bond as the USA and the North are about to start denuclearization negotiations.
CCTV showed Kim in talks with Xi on Tuesday at the Great Hall of the People in Beijing.
Also Friday, the United States and South Korea agreed to indefinitely suspend two exchange program training exercises, to support diplomatic negotiations with North Korea, the Pentagon said.
"This is a part of follow-up measures after the North Korea-U.S. summit and South Korea-North Korea summit".
Government and military officials in South Korea said Friday that the return of the remains is expected to take a significant amount of time given how many there are and that various ideas about the method of repatriation are being mulled.
The backdoor could open further as the U.S. and the North proceed with denuclearization talks. North Korea's posturing could be China's way of leveraging its involvement in negotiations versus the $50 Billion worth of tariffs imposed by Trump's administration.
A bigger cause for concern is that Trump, who now seems to have a two-track approach - military and economic - toward what he had called "maximum pressure", may ease his position on economic sanctions, too.
This was stated in a joint document signed by Mr Trump and Mr Kim. The two allies announced Monday the suspension of the Freedom Guardian drill slated for August in line with Trump's push for alleviating military pressure against the North. "We advise the USA side to return to reason, and stop words and actions that harm itself and others".
At the Cabinet meeting, Trump also referenced other concessions North Korea has supposedly made: "They've already blown up one of their big test sites".
As experts highlighted, it should be noted that Kim never mentioned CVID, only repeating a "phased, synchronized" approach toward denuclearization.
US and South Korean forces have been training together for years, and routinely rehearse everything from beach landings to an invasion from the North, or even "decapitation" strikes targeting the North Korean regime.