At the heart of Trump’s latest trade deal with Vietnam and talks with other trading partners is an effort to counter what he sees as China’s unfair practices to circumvent U.S. tariffs.

“Vietnam will pay the United States a 20% Tariff on any and all goods sent into our Territory, and a 40% Tariff on any Transshipping,” Trump said on his social network. “In return, Vietnam will do something that they have never done before, give the United States of America TOTAL ACCESS to their Markets for Trade.”

Vietnam finds itself caught between its two biggest trading partners as the Trump administration tries to stop Chinese exporters using Vietnam as a way station.