The move came during President Barack Obama's first visit to Hanoi, which his welcoming hosts described as the arrival of a warm spring and a new chapter in relations between two countries that were at war four decades ago.
Obama, the third U.S. president to visit Vietnam since diplomatic relations were restored in 1995, has made a strategic 'rebalance' towards Asia a centrepiece of his foreign policy.
Vietnam, a neighbour of China, is a key part of that strategy amid worries about Beijing's assertiveness and sovereignty claims in the South China Sea.
The decision to lift the arms trade ban, which followed intense debate within the Obama administration, suggested that such concerns outweighed arguments that Vietnam had not done enough to improve its human rights record and that Washington would lose leverage for reforms. Obama told a joint news conference with Vietnamese President Tran Dai Quang that disputes in the South China Sea should be resolved peacefully and not by whoever "throws their weight around". But he insisted the arms embargo move was not linked to China.
"The decision to lift the ban was not based on China or any other considerations. It was based on our desire to complete what has been a lengthy process of moving towards normalisation with Vietnam," he said. He later added that his visit to a former foe showed "hearts can change and peace is possible".
The sale of arms, Obama said, would depend on Vietnam's human rights commitments, which would be made on a case-by-case basis.
Human Rights Watch reacted with dismay to Washington's decision to toss away a critical lever it might have had to spur political reform in the communist party-ruled state.
Phil Robertson, the watchdog's Asia director, said in a statement that even as Obama was lifting the arms embargo Vietnamese authorities were arresting a journalist, human rights activists and bloggers on the street and in their houses.
"In one fell swoop, President Obama has jettisoned what remained of U.S. leverage to improve human rights in Vietnam - and basically gotten nothing for it," he said. Obama told the news conference with President Quang that Washington would continue to speak out for human rights, including citizens' right to organise through civil society.
Quang, who actually announced the U.S. embargo lift before Obama could do so, was until recently minister of public security, which activists say harasses and arrests dissidents.
Dissent was once the domain of just a few in Vietnam, but while the party has allowed more open criticism in recent years, it is quick to slap down challenges to its monopoly on power.
Though the communist parties that run China and Vietnam officially have brotherly ties, China's brinkmanship over the South China Sea - where it has been turning remote outcrops into islands with runways and harbours - has forced Vietnam to recalibrate its defence strategy.
Security analysts and regional military attaches expect Vietnam's initial wish list of equipment to cover the latest in surveillance radar, intelligence and communications technology, allowing them better coverage of the South China Sea as well as improved integration of its growing forces.
Hanoi's military strategists are also expected to seek drones and possibly P-3 Orion surveillance aircraft from the United States.
Carl Thayer, an expert on Vietnam's military at Australia's Defence Force Academy, said the steep costs of U.S. arms would remain a factor for Hanoi, pushing it towards its traditional suppliers of missiles and planes, particularly long-time security patron, Russia. On the other hand, the lifting of the embargo will provide Vietnam with leverage in future arms deals with those suppliers.
China sees U.S. support for rival South China Sea claimants Vietnam and the Philippines as interference and an attempt to establish hegemony in the region. Washington insists its priority is ensuring freedom of navigation and flight.
However, China's response to the announcement in Hanoi was muted. The foreign ministry said it hoped the development in relations between the United States and Vietnam would be conducive to regional peace and stability.
Underlining the burgeoning commercial relationship between the United States and Vietnam, one of the first deals signed on Obama's trip was an $11.3 billion order for 100 Boeing planes by low-cost airline VietJet.
China is Vietnam's biggest trade partner and source of imports. But trade with the United States has swelled 10-fold over the past two decades to about $45 billion, and Vietnam is now Southeast Asia's biggest exporter to America.
In the commercial hub, Ho Chi Minh City, formerly Saigon, Obama will on Tuesday meet entrepreneurs and tout a Trans-Pacific Partnership trade deal he has championed, in which Vietnam would be the biggest beneficiary of the 12 members.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)