The U.S. Navy's top admiral is making a three-day visit to China and meeting with his Chinese counterpart at a time when Beijing has rejected an international tribunal's ruling that invalidated its expansive claims in the South China Sea.

Adm. John Richardson, chief of naval operations, will meet the commander of the People's Liberation Army's Navy, Adm. Wu Shengli, during his trip to the Chinese capital of Beijing and the port city of Qingdao starting Sunday.

They will discuss the South China Sea, ongoing Rim of the Pacific, or RIMPAC, military drills, and ways to boost interactions between the two militaries.

The visit comes as China has warned other countries against threatening its security in the South China Sea.