Manufacturers in China have found workarounds, and experts say that could be a lesson for U.S. policymakers. Export data released last week show EV exports from China to the European Union increased 8.3% year-over-year, a reversal of the approximately 40% and 25% plunges the measurement took in October and November, respectively.

Tesla and Germany’s BMW are suing the European Commission, joining a growing band of Chinese automakers to oppose the European Union on its punitive tariffs on electric vehicles.

The EU imposed anti-subsidy tariffs of 7.8% on Tesla on top of the 10% levy. BMW’s imports were hit with a 20.7% duty. The firm was hit because its electric Mini Cooper and the 100% electric Mini Aceman are made in China, according to car website Autogear.