Xi Jinping is in Southeast Asia to build bonds with countries that also face U.S. tariffs and have come under pressure from Washington to curb the transshipment of Chinese goods.

In hope of avoiding punishing U.S. tariffs, Vietnam is prepared to crack down on Chinese goods being shipped to the United States via its territory and will tighten controls on sensitive exports to China,

China on Monday warned other countries against making trade deals with the United States to China’s detriment. Governments including those of Taiwan, Japan and South Korea have begun negotiations with Washington after President Donald Trump announced sweeping tariffs against almost all of America’s trading partners on April 2.