South Korea's benchmark KOSPI index fell 0.27 percent to 6,870.81 on Tuesday, its second straight daily loss, as foreign and institutional investors sold shares. Rising oil prices amid renewed U.S.-Iran tensions stoked fears that inflation and interest rates will stay high, pushing the U.S. 10-year Treasury yield to 5.23 percent, near multiyear highs. The moves matter because export-reliant Asian markets are sensitive to energy costs and global borrowing rates, while the Korean won strengthened against the dollar.