The Korean won sharply weakened against the U.S. dollar Thursday due to renewed tensions in the Middle East as the United States and Iran engaged in a fresh round of airstrikes. The won was quoted at 1,529.7 won per dollar at 3:30 p.m., down 13.3 won from the previous session. The won opened at 1,530.8 won per dollar, down 13.6 won from the previous session's close, but recouped some losses after Finance Minister Koo Yun-cheol warned that author…