WASHINGTON/BEIJING (Reuters) – The United States voiced willingness on Wednesday to negotiate a resolution to an escalating trade fight with China after Beijing retaliated against proposed U.S. tariffs on $50 billion in Chinese goods by targeting key American imports, but the Chinese ambassador to Washington said it “takes two to tango.”(Graphic: U.S. trade in goods with China – http://tmsnrt.rs/2GcOZIH)