China filed a complaint with the World Trade Organization against U.S. tariffs on steel and aluminum imports.
Those tariffs — which U.S. President Donald Trump imposed back in March — are just one facet of the U.S. and China's back-and-forth tariff battle.
The trade organization announced the complaint on the same day Chinese President Xi Jinping said his country would "significantly lower" tariffs on vehicle imports and improve intellectual property protection.
The Associated Press noted Xi's promises could be seen as "possible concessions aimed at defusing" the trade dispute.
After all, Trump complained about China's tariffs on imported cars as recently as Monday.
The Trump administration reportedly isn't taking Xi's speech at face value. One White House official told Bloomberg it expects to see concrete proposals from China.