Asia-Pacific's largest security forum was set to begin Thursday as top diplomats gathered in Malaysia, but steep tariffs by U.S. President Donald Trump are expected to overshadow the annual gatherings.

China warned the Trump administration on Tuesday against reigniting trade tension by restoring tariffs on its goods next month, and threatened to retaliate against nations that strike deals with the United States to cut China out of supply chains.

Chinese state media reported Tuesday that the country would increase its tariffs on the United States if President Donald Trump sidelines the country in trade deals with other countries. The country argues that if the U.