Shares in Airbus and French luxury goods exporters fell on Monday as the European Union acknowledged it may face U.S. tariffs in a long-running dispute over aircraft subsidies, part of an escalating tit-for-tat trade row.

The World Trade Organization has approved a U.S. request to impose tariffs on European goods in the latest chapter of a dispute over aircraft subsidies that could lead to European reprisals, two people familiar with the case said.

The scope of the decision, which had been widely anticipated, is due to be announced in the week of Sept 30.