US President Joe Biden and Chinese President Xi Jinping have made progress on some key issues during their summit, including the resumption of high-level dialogue between the two countries' militaries. But they failed to find common ground over Taiwan, and their positions apparently remain far apart.

Biden and Xi met near San Francisco on Wednesday. It was their first summit in about a year.

US officials say the two leaders agreed to resume their defense chiefs' talks for the first time since last November.

The two sides are also resuming dialogue between their commanders, reportedly on such issues as military drills and deployments of forces.

Biden and Xi also affirmed the need to improve AI safety through US-China government talks, and agreed to cooperate to combat global illicit drug manufacturing and trafficking.

On Taiwan, a senior US official says Biden noted that China's military activity around Taiwan is increasing tension and concern. Biden reportedly suggested that China reconsider its strategy.

Biden was also quoted as asking China not to intervene in Taiwan's presidential election scheduled for January.

China's Foreign Ministry says Xi stressed in response that the United States should stop arming Taiwan and support China's peaceful unification.

The senior US official also said Xi strongly denied reports in the US that China is planning military operations in 2027 or 2035.

Xi was quoted as saying that there is no such plan and he has never heard about it from anyone.