North Korean leader Kim Jong Un left Beijing after talking and dining with Chinese President Xi Jinping, according to South Korean media, in a show of unity as they engage in delicate negotiations with President Donald Trump's administration.

Kim spent a little more than a day in the Chinese capital and was en route to Pyongyang by 2 p.m. Wednesday, Yonhap news agency of South Korea reported, citing unidentified officials. His delegation was seen off by high-ranking Chinese officials and honor guard at a Beijing train station and could return to North Korea as soon as Thursday morning, Yonhap said.

The trip — Kim's fourth to China since March — suggests negotiations over North Korea's nuclear arsenal are gaining momentum after months without high-level diplomatic exchanges. Trump is seeking a second summit with Kim to reenergize talks that have made little headway since their first meeting in June, saying Sunday a date would be announced "in the not-too-distant future."