The U.S.-China chip war could impact South Korea's chip giants as China accounts for a large chunk of their production capacity — but there shouldn't be long-term disruptions, according to Fitch Ratings. Samsung Electronics and SK Hynix face risks as the U.S. seeks to block China's access to advanced semiconductor chip equipment, according to the June 7 report. China accounts for 40% of Samsung's total flash memory chips (NAND) production capability, said the analysts led by Matt Jamieson. It also accounts for 40%-50% of SK Hynix's dynamic random access memory (DRAM) chips and 20% of its NAND capacity. "We do…