The United States and China have reached an agreement — again — to deescalate trade tensions. But details are scarce, and the latest pact leaves major issues between the world's two biggest economies unresolved.

China firmly opposes any countries reaching trade agreements with the US that would sacrifice Chinese interests in exchange for tariff relief, according to a statement from the Ministry of Commerce on Saturday night.

The U.S. and China have agreed on the framework for a trade deal, both nations say. It appears that rare earth minerals are one key part of it.