A brief Pentagon statement said Chinese Ambassador Xie Feng discussed defense relations and "a range of international and regional security issues" in talks with Ely Ratner, a U.S. assistant secretary of defense.

"Ratner also underscored the Department's commitment to maintaining open lines of military-to-military communication between the United States and the PRC," Pentagon spokesperson Lieutenant Colonel Martin Meiners said, using the acronym for China's official name.

The discussions lasted about 90 minutes, Meiners said.

China's embassy in Washington did not immediately respond to a request for comment.

With U.S.-China relations at a low over national security issues, including Taiwan, U.S. export bans on advanced technologies and China's state-led industrial policies, Washington has been trying to repair ties between the world's two biggest economies.

U.S. Treasury Secretary Janet Yellen visited China earlier this month and climate envoy John Kerry is expected to visit next week. Secretary of State Antony Blinken traveled to Beijing last month, the first trip to China by a U.S. secretary of state since 2018.

But Beijing snubbed U.S. Defense Secretary Lloyd Austin's efforts to hold an in-depth meeting with his Chinese counterpart at a defense forum in Singapore last month, and military communications have stalled.

"We have regularly reached out to thicken our crisis communications and crisis management channels with Beijing and they have serially pushed us off," Colin Kahl, the Pentagon's top policy adviser, told a forum in London on July 10.

China has publicly cited U.S. sanctions as an obstacle to military dialogue. Chinese Defence Minister Li Shangfu has been sanctioned since 2018 over the purchase of combat aircraft and equipment from Russia's main arms exporter, Rosoboronexport.

But Kahl said in London that China appeared to be concerned that Washington was going to use crisis management channels "so we can have more crises".

"When we have these conversations with them, they're like: 'If you don't want crises, there's a simple answer ... Get out. Like, you're not a Pacific power," Kahl said, adding that was a strange thing to hear as someone from the Pacific coast state of California.

(Reporting by Phil Stewart, David Brunnstrom and Rami Ayyub; editing by Mark Heinrich)

By Phil Stewart and David Brunnstrom