Reuters reports that the European Union should gain formal clearance next week to impose tariffs on $4 billion of annual U.S. imports in a dispute over aircraft subsidies, a World Trade Organization document showed on Monday.

The EU won the right to retaliation in its dispute with the United States over subsidies to planemaker Boeing this month.

Under WTO rules, the EU needs to formally notify its plan to impose tariffs to the Dispute Settlement Body (DSB), a committee on which all 164 WTO members sit. According to the DSB agenda, the EU plans to do so at the next meeting on Oct. 26.

This does not necessarily mean the bloc will impose tariffs immediately. The European Commission, which coordinates EU trade policy, also has to consult with the 27 EU governments on the issue.