South Korea and the United States began their largest joint military drills in years on Monday with a resumption of field training, officials said, as the allies seek to tighten readiness over North Korea’s potential weapons tests. Reuters reports that the annual summertime exercises are scheduled to end on Sept. 1, and came after South Korean President Yoon Suk-yeol, who took office in May, vowed to “normalise” the combined exercises and boost deterrence against the North.