The Sukhoi Su-22 fighters crashed offshore from southern Binh Thuan province's coast during a diving practice, Thanh Nien newspaper said.
Vietnam conducts regular military training exercises along its lengthy coastline.
The People's Army of Vietnam uses the Russian-made fighter jets for patrols over the portion of the contested Spratly Islands that Vietnam controls.
The country is currently locked in a long-standing territorial dispute with neighbouring China over a number of islands in the South China Sea, which Hanoi calls the "East Sea".
Tensions came to a head when Beijing moved an oil rig into waters claimed by Hanoi last year, triggering deadly anti-China riots in Vietnam.
China controls the Paracel Islands, after seizing them from what was then South Vietnam in a brief battle in 1974.
The Spratly Islands are also claimed in whole or in part by the Philippines, Malaysia, Brunei and Taiwan.
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
