U.S. Secretary of State Antony Blinken visited Vietnam on Saturday to pay his respects following the death of Communist Party chief Nguyen Phu Trong, underlining warmer ties between the countries a half-century since they fought a brutal war.

Blinken arrived in Hanoi late Saturday after attending a regional summit in Laos and visited the family home of Trong, a Marxist-Leninist ideologue who as party chief was Vietnam's most powerful figure for 13 years and who died last week at 80.

Trong's "bamboo diplomacy" trod a delicate balancing act between rival superpowers the United States and Communist neighbor China, helping to elevate Vietnam's ties with both of its two biggest trade partners.

Blinken greeted Trong's family before lighting an incense stick in front of a shrine displaying the general secretary's photo. He then stood for a moment with his hands clasped in a show of respect.

He wrote a page-long message in a condolence book and, during conversations with Trong's family, conveyed the condolences of President Joe Biden.

Trong's two-day state funeral, which ended Friday, drew more than 250,000 Vietnamese mourners in ceremonies in Hanoi, Ho Chi Minh City and his home in Dong Anh on the outskirts of the capital, state media reported.

Blinken's brief visit comes at a sensitive time for U.S.-Vietnam relations, which have improved of late given shared concerns about China's growing regional clout and interest from U.S. investors in a country with an economy that grew an average 5.8% annually during Trong's time in office.

During a visit by Biden to Hanoi last year, the U.S. and Vietnam upgraded ties to a comprehensive strategic partnership, and U.S. Treasury Secretary Janet Yellen has promoted Vietnam as a "friend-shoring" destination to shift U.S. supply chains away from China.

On Friday, the U.S. Commerce Department is set to announce whether to upgrade Vietnam to market economy status, something Hanoi has long sought.

The upgrade is opposed by U.S. steelmakers, Gulf Coast shrimpers, honey farmers and members of the U.S. Congress representing them, but backed by retailers and some other business groups.

After visiting Trong's home, Blinken also met Vietnam's president, To Lam, the former internal security agency chief who has assumed Trong's duties, and Prime Minister Pham Minh Chinh.

Blinken told Lam Trong was a "visionary leader" who built a lasting bridge between the two countries and showed the world they could move forward despite their difficult past.

In his meeting with the prime minister, Blinken said one of the highlights of the Biden administration was its elevation of its strategic ties with Hanoi.