On October 12, 2026, the French Navy inspected the tanker DF PEAK due to suspicion of a false flag over 450 miles south of Réunion Island. This is the sixth operation since September 2025 in which French Navy inspection teams have acted on tankers with suspicious flags. Among these, the tanker DELIVER was also inspected near Sicily in June, marking the fifth operation of this kind.
Increased Pressure at Sea
Navy planners often talk about readiness for intense warfare, especially regarding major conflicts between military powers. However, the emergence of the Shadow Fleet indicates increasing pressure at sea before such conflicts occur. French warships frequently stop and inspect commercial tankers. While Moscow refers to these operations as piracy, Paris describes them as enforcement of international maritime law.
Doubt About the Flag
Shadow Fleet tankers conceal their identity and location. They sometimes turn off the AIS system for days and use flag changes, invalid registrations, and frequent name changes. This identity issue is the main reason for most French inspections, which begin with doubts about the flag, not the cargo of the ship.
The legal basis for these operations is straightforward. French officials have described these operations under the United Nations Convention on the Law of the Sea (UNCLOS). In the case of DF PEAK, the French Armed Forces General Staff cited Article 110 of this convention, which grants warships the right to visit the high seas when a ship is suspected of being unflagged or having a false flag. In other words, the legal flag is what authorized France to inspect DF PEAK.
Identification Challenges
The AIS system is designed to prevent ship collisions, not to verify identity. The flag, name, and destination that a tanker broadcasts are entered inside the ship, and no signal checks them against registrations. There is a significant gap. Windward's maritime risk report for the second quarter of 2026 indicates that 275 tankers engaged in international trade are broadcasting a false registration flag, and 22 false registrations have been identified. By the end of September, the list of ships with false flags from the International Maritime Organization (IMO) reached 613, showing a 39% increase since January.
To prove that a flag is false, the emitted signal must be checked against evidence that the ship does not control, such as registration records, IMO data, and ownership chains. Windward's assessment has shown that inspections providing the best legal evidence are supported by data from a legitimate flag country that contradicts what the ship broadcasts.
Behavioral History and the Need for International Cooperation
The behavioral history of a tanker can indicate which tankers need inspection. 78% of the Dark Fleet is under sanctions from the United States, the United Kingdom, or the European Union. Additionally, according to Windward, six European inspections in the first quarter of 2026 had a stop rate of less than 2%.
Allied naval forces must have a similar picture before inspections. Reports indicate that previous French operations in the Mediterranean have been supported by fast patrol boats from the Royal Navy. This intelligence cooperation has helped identify and stop suspicious vessels, highlighting the need for international coordination in combating maritime threats.
