BEIJING--China and Vietnam sought to mend ties during a Vietnamese official's visit to Beijing this week, but they appeared to make little headway in finding a concrete solution to a simmering dispute in the South China Sea.

Chinese President Xi Jinping attempted to play down tensions between the nations during a meeting with Vietnamese special envoy Le Hong Anh on Wednesday.

"A neighboring nation cannot be moved, and it is in the common interests of both countries to be friendly to each other," said Mr. Xi, according to an account by China's Foreign Ministry.

Vietnam's Foreign Ministry said in a statement that the countries agreed to avoid actions in the South China Sea that would heighten tensions as they seek lasting agreements that would help to resolve the maritime row.

Relations between the neighboring nations had been strained since May, when a Chinese oil rig appeared unannounced in disputed South China Sea waters to begin exploration. The move drew criticism from Vietnam, which dispatched government vessels to confront the rig, leading to a series of ramming incidents between Chinese and Vietnamese vessels.

The two-month standoff marked the sharpest deterioration of China-Vietnam relations in years. Washington has criticized Beijing's actions as provocative. China has described the deployment of the rig as a normal business activity on the part of one of its companies.

It remains to be seen whether Mr. Xi's remarks mean China will slow its South China Sea push. China claims nearly the entire sea as historical waters, an assertion that brings it into conflict with neighbors such as Vietnam and the Philippines. Along with China, five other governments claim parts of the South China Sea.

The rig at the center of the latest dispute, HYSY 981, is controlled by China National Offshore Oil Corp., the country's main state-controlled offshore oil producer. The rig was operating in waters around the disputed Paracel Islands chain, which is claimed by both China and Vietnam.

The rig was removed from the disputed waters in mid-July after Cnooc said it had completed drilling and exploration in the waters around Triton Island, or Zhongjian Island in Chinese, part of the Paracels.

The dispute over the rig led to deadly riots in Vietnam and attacks against Chinese businesses. At least five Chinese nationals were killed in the violence, and Chinese and other foreign factories were looted and burned.

Vu Trong Khanh in Hanoi contributed to this article.

Write to Brian Spegele at brian.spegele@wsj.com

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