China won't change its opposition to protectionism in its ongoing bilateral trade negotiations with the United States, its commerce ministry spokesman said on Thursday, even as a top Beijing official is expected to visit Washington soon for talks. Commerce ministry spokesman Gao Feng said during a regular briefing the United States and China are currently preparing the next round of discussions. A U.S. trade delegation visited Beijing last week for talks but left without significant progress in resolving an escalating trade dispute between the world's two largest economies. "The United States must put away its threatening stick. China's position has not changed and will not change," Gao said. He said China opposed protectionism and unilateralism in trade relations. Beijing has previously said it will not negotiate on its core interests, though it has not clearly defined what those are. "But we hope that China-US trade relations can become a powerful driving force for sustained growth of the global economy," he added. Meanwhile, China confirmed, on Wednesday, that Vice Premier Liu He will visit the U.S. to discuss trade at an appropriate time.