METALS-Copper edges higher amid mixed China-U.S. trade signals

London copper edged up on Monday after U.S. President Donald Trump said he may not impose more tariffs on Chinese goods, but gains were capped amid tensions between the two major economies at a regional summit. Trump said on Friday China was willing to take steps to resolve the prolonged U.S.-China trade war, but Vice President Mike Pence said the following day the United States might even double its tariffs,