BANGKOK (AP) — Chinese leader Xi Jinping arrived in Vietnam on Tuesday seeking to further deepen ties with the Southeast Asian nation, weeks after it elevated its diplomatic relations with Western-aligned countries.

In his first visit since 2017, Xi will meet with Communist Party General Secretary Nguyen Phu Trong, President Vo Van Thuong and Prime Minister Pham Minh Chinh, Vietnam’s Foreign Ministry said.

“This reflects Beijing’s concerns about Hanoi’s advances with the West,” said Nguyen Khac Giang, a visiting fellow with the ISEAS–Yusof Ishak Institute in Singapore. “Concerns that Vietnam may join an anti-China alliance and gang up against China.”

The Chinese leader received a red carpet welcome as Chinh greeted him on the tarmac. Dozens of Chinese and Vietnamese nationals gathered at the airport, waving Chinese and Vietnamese flags to welcome Xi and his wife, Peng Liyuan, who accompanied him on the visit.

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Xi’s visit marks 15 years of China being a “comprehensive strategic partner” of Vietnam, the highest official designation for a diplomatic relationship.

Vietnam plays an increasingly important strategic role in security and the economy in Southeast Asia.

Ideologically, Vietnam is closer to Beijing. It is run by a Communist Party with strong ties to China. But in recent months, Vietnam has signaled closer ties with Western countries.

In September, U.S. President Joe Biden visited Vietnam to mark the U.S. being elevated to the same diplomatic status as China. Biden asserted that the stronger ties were not about countering China, though U.S. diplomacy across Asia and the Pacific has been focused on improving defense ties with countries to do just that.

In November, Japan and Vietnam boosted their economic and security ties, citing a “free and open Indo-Pacific,” with Japan being given the same diplomatic status as China and the U.S.. Japan has been rapidly developing closer ties with Vietnam and is its third-largest foreign investor.

Experts say Vietnam is hedging against its large neighbor and its geographical claims.

“You can see that they’re flexible and balancing big powers,” said Nguyen Thanh Trung, a professor of Vietnamese studies at Fulbright University Vietnam.

Vietnam is one of several countries to clash with China in the disputed South China Sea, particularly on two archipelagos, the Spratlys and the Paracel Islands. It has faced off with China’s coast guard in the past in the disputed waters. Vietnam usually does not publicize the confrontations.

In October, Xi told the Vietnamese president that amid “changing international landscapes” the two nations should continue to develop their “traditional friendship.”

The two spoke after attending China’s Belt and Road Forum. Vietnam is likely to sign some infrastructure agreements with Beijing, as it has paid close attention to the development of the Chinese-built high-speed rail in Laos, completed in 2021.

“The Vietnamese prime minister wants to focus on more infrastructure,” said Nguyen, the professor. “He thinks it’s key to economic growth.”

China has been Vietnam’s largest trading partner for several years, with a bilateral trade turnover of $175.6 billion in 2022. Imports from China, including crucial inputs for Vietnam’s manufacturing sector, make up 67%, according to Vietnam customs data cited by Vietnamese state media.

However, the trade is at a deficit in China’s favor.

China has over $26 billion invested in Vietnam, with more than 4,000 active projects.

Xi’s 2017 visit to Vietnam was for an Asia-Pacific economic summit in the coastal city of Danang.

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AP writer Aniruddha Ghosal in Hanoi, Vietnam contributed to this report.