North Korea accused the United States on Tuesday of pushing the Korean peninsula to the brink of nuclear war after a pair of strategic US bombers flew training drills with the South Korean and Japanese air forces in another show of strength. The two supersonic B-1B Lancer bombers were deployed amid rising tensions over North Korea's pursuit of its nuclear and missile programs in defiance of UN sanctions and pressure from the United States. South Korean Defense Ministry spokesman Moon Sang-gyun told a briefing in Seoul that Monday's joint drill was conducted to deter provocations by the North. North Korea said the bombers conducted "a nuclear bomb dropping drill against major objects" in its territory at a time when Trump and "other US warmongers are crying out for making a preemptive nuclear strike" on the North. "The reckless military provocation is pushing the situation on the Korean peninsula closer to the brink of nuclear war," the North's official KCNA news agency said on Tuesday. Tensions on the Korean peninsula have been high for weeks, driven by concerns that the North might conduct its sixth nuclear test in defiance of pressure from the US and Pyongyang's sole major ally, China. The US military's THAAD anti-missile defense system has reached initial operational capacity in South Korea, US officials said, although they cautioned that it would not be fully operational for some months. Meanwhile, China demanded on Tuesday an immediate halt to a controversial US missile shield hours after Washington announced that the defense system was now operational in South Korea. THAAD's deployment has infuriated China, which fears it will weaken its own ballistic missile capabilities and says it upsets the regional security balance. "We oppose the deployment of the THAAD system in (South Korea) and urge relevant sides to immediately stop the deployment. We will firmly take necessary measures to uphold our interests," foreign ministry spokesman Geng Shuang said at a regular press briefing. Trump warned in an interview with Reuters on Thursday that a "major, major conflict" with North Korea was possible, while China said last week the situation on the Korean peninsula could escalate or slip out of control. In a show of force, the United States has already sent an aircraft carrier strike group, led by the USS Carl Vinson, to waters off the Korean peninsula to conduct drills with South Korea and Japan. — Agencies