BEIJING (AP) – China filed a World Trade Organization case Monday challenging U.S. anti-dumping measures on billions of dollars of kitchen appliances, paper and other goods, adding to worsening trade strains as global demand weakens.

Beijing’s move came shortly before the Obama administration filed its own WTO case accusing China of improperly subsidizing exports of automobiles and auto parts.

China and the U.S. have clashed over complaints about market barriers and subsidies for goods including autos, solar panels, tires, steel and chicken. Political pressures on both sides are worsening as demand for their goods cools, raising the threat of job losses in export industries.