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.”

With the dust far from having settled on this week’s US-Vietnam trade agreement, one thing is clear: companies operating in what’s become one of the most vibrant Asian economies are on notice to move up the value chain.