North Korea's military conducted its firing after detecting dozens of "projectiles" fired in the South near the shared border, state news agency KCNA reported, citing a spokesperson of the General Staff of the Korean People's Army."The enemy should immediately cease military actions that cause escalation of tensions in areas near the front lines where visual surveillance is possible," the unnamed spokesperson said, warning that the North would respond firmly and with overwhelming military action to any provocation.North Korea has criticised the joint drills as evidence of a hostile policy by Washington and Seoul.The 2018 Comprehensive Military Agreement (CMA) was the most substantive deal to come from the months of meetings between leader Kim Jong Un and then-South Korean President Moon Jae-in.South Korea has accused the North of repeatedly violating the agreement with artillery drills this year, including one day in mid-October when more than 500 rounds were fired into the sea."