Mekong Brief is biweekly trade intelligence on Vietnam, written from Ho Chi Minh City for buyers, exporters, and the people advising them.

Issue #2 publishes in Bangkok, where I'm spending the week at THAIFEX-Anuga Asia -- Asia's largest food trade show. Vietnam has a significant presence here: around 170 companies are on the floor, from the Ho Chi Minh City joint pavilion to individual exhibitors across seafood, coffee, processed foods, and fresh produce. I'm here to learn what international buyers want and whether Vietnam's exporters are positioned to deliver it. Two compliance deadlines that matter for this audience close before the show does -- GACC Decree 280 takes effect Monday and USTR's Section 301 window closes Friday.

The US government's most serious IP trade designation in 13 years now has a countdown. USTR's April 30 Special 301 Report elevated Vietnam to Priority Foreign Country status -- the top tier of the IP enforcement framework, unused against any country since 2013 -- triggering a 30-day window for USTR to decide whether to open a formal Section 301 investigation (USTR, April 30, 2026). That window closes May 30 -- four days from now. No announcement as of this morning.

Preliminary anti-dumping rates on frozen warmwater shrimp from Vietnam posted May 13. Fimex Group: 6.76%. STAPIMEX: 10.76%. Twenty-seven separate-rate firms: 7.56%. The remaining 132 companies: 25.76% Vietnam-wide rate (Fed. Reg. 2026-09465). Final determination expected around November 2026. NOAA separately recognized four Vietnamese crab fishing operation codes as MMPA-equivalent on May 11 -- covering blue and red swimming crab by gillnet and trap methods, valid through December 31, 2029. For crab exporters, that's a market-access win in the same two-week stretch that handed shrimp exporters a preliminary rate increase.

China GACC Decree 280 takes effect Monday, June 1. The new food facility registration framework extends mandatory GACC registration to cold storage for animal-origin food products -- including seafood -- a scope expansion that did not exist under Decree 248 (USDA FAS GAIN CH2025-0204). Approximately 4,000 Vietnamese facilities are in the GACC system. Exporters with outdated registration data risk rejected shipments starting Monday.

The 10% US tariff is still at the border. The Federal Circuit entered an administrative stay on May 12, pausing the Court of International Trade's May 7 ruling that Section 122 exceeded presidential authority. The tariff continues at the border; the appeal proceeds on merits and scope of relief. July 24 statutory expiry unchanged (Holland & Knight, May 2026).

In the 2026 Special 301 Report, USTR designated Vietnam a Priority Foreign Country -- one tier above the Priority Watch List where Vietnam had spent the previous decade, and the first PFC designation applied to any country in 13 years. The designation reflects a formal finding that Vietnam's IP enforcement failures are serious enough to warrant the most severe response available under the Special 301 process (USTR 2026 Special 301 Report).

USTR's stated concerns: persistent online piracy and counterfeit goods, enforcement gaps at Vietnam's borders, no criminal penalties for satellite signal theft, and institutional disruption from Vietnam's 2025 administrative reorganization -- which folded several IP enforcement agencies into new structures and left enforcement capacity degraded during the transition.

The window to decide on a formal investigation closes May 30. As of this morning, no announcement has been made.

What a Section 301 investigation is -- and isn't

This track runs parallel to the Section 122 / framework agreement process. Section 301 gives USTR authority to investigate and respond to foreign government acts or policies that burden US commerce. Unlike Section 122, it carries no statutory rate cap and no expiration date. An investigation can produce targeted or broad tariffs, import restrictions, or the suspension of trade agreement benefits -- at USTR's discretion. The authority was last deployed at this scale in the 2018 China technology-transfer investigation, which produced initial tariffs of 25% on $34 billion of imports and escalated from there. Typical timeline from investigation initiation to proposed trade actions: six to twelve months.

For Vietnamese exporters, the exposure cuts across sectors rather than concentrating in one. Seafood, coffee, apparel, electronics, and processed foods all depend heavily on US market access; a broad Section 301 action would have no product-category ceiling. Exporters operating under the assumption that the framework agreement provides a rate ceiling should note that it doesn't cover this authority.

Vietnam's response

Hanoi has moved quickly. MOIT has activated its IP enforcement task force, directing provincial authorities to increase enforcement actions. VASEP issued emergency compliance guidance to seafood exporters following the April 30 designation. The government's public posture has been cooperative rather than adversarial -- state media frames this as a compliance challenge, not a diplomatic confrontation. Whether that posture shifts if an investigation is formally opened is an open question.

The frame that matters

The framework negotiation and the IP enforcement track are not the same conversation. One is about what rate you're paying. The other is about whether the rules that determine that rate stay stable.