ANKARA  The US and South Korea on Monday launched a major joint military drill, with President Yoon Suk Yeol calling for bolstering readiness against North Korea's "gray zone provocations and hybrid warfare." The 11-day Ulchi Freedom Shield (UFS) exercise, an annual affair, is aimed at bolstering joint defense readiness amid "advancing North Korean military threats," Seoul-based Yonhap News reported. The exercise, which runs through Aug. 29, is being held on the heels of heightened cross-border