While an escalating trade fight between Japan and South Korea is already affecting U.S. supply chains, the Trump administration has yet to show definitively whether it plans to intervene -- though industry officials and analysts say they would like to see the U.S. do so. The U.S. has historically and economically strong relationships with both countries, including a recently renegotiated trade deal with South Korea and trade talks that could produce a limited deal with Japan in short order. President...