SEOUL/BEIJING - 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 programmes in defiance of UN sanctions and pressure from the United States.

The flight of the two bombers on Monday came as US President Donald Trump said he would be “honoured” to meet North Korean leader Kim Jong Un in the right circumstances, and as his CIA director landed in South Korea for talks.

South Korean Defence 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 United States and Pyongyang’s sole major ally, China.

The US military’s THAAD anti-missile defence system has reached initial operational capacity in South Korea, US officials told Reuters, although they cautioned that it would not be fully operational for some months.

China has repeatedly expressed its opposition to the system, whose powerful radar it fears could reach inside Chinese territory. Foreign Ministry spokesman Geng Shuang again denounced THAAD on Tuesday.

“We will resolutely take necessary measures to defend our interests,” Geng said, without elaborating.

Asked about Trump’s suggestion he could meet Kim, Geng said China had noted US comments that it wanted to use peaceful means to resolve the issue. Trump has been recently been full of praise of Chinese President Xi Jinping’s efforts to rein in its neighbour.

“China has always believed that using peaceful means via dialogue and consultation to resolve the peninsula’s nuclear issue is the only realistic, feasible means to achieve denuclearisation of the peninsula and maintain peace and stability there, and is the only correct choice,” Geng told a daily news briefing.

It was widely feared North Korea could conduct its sixth nuclear test on or around April 15 to celebrate the anniversary of the birth of the North’s founding leader, Kim Il Sung, or on April 25 to coincide with the 85th anniversary of the foundation of its Korean People’s Army.

The North has conducted such tests or missile launches to mark significant events in the past.

Instead, North Korea conducted an annual military parade, featuring a display of missiles on April 15 and then a large, live-fire artillery drill 10 days later.

“VIGILANCE, READINESS”

Acting South Korean president Hwang Kyo-ahn called for stronger vigilance because of continuing provocation by North Korea and for countries such as China to increase pressure on the North.

The US military said Mike Pompeo, director of the Central Intelligence Agency, visited South Korea and conducted detailed security discussions with his South Korean counterpart Lee Byung-ho and also visited Yeonpyeong island, which was bombed by North Korea in 2010.

Trump drew criticism in Washington on Monday when he said he would be “honoured” to meet North Korea’s young leader.

“If it would be appropriate for me to meet with him, I would absolutely, I would be honoured to do it,” Trump told Bloomberg News.

Trump did not say what conditions would be needed for such a meeting to occur or when it could happen. “Clearly conditions are not there right now,” White House spokesman Sean Spicer said.

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. orth Korea test-launched a missile on Saturday that appeared to have failed within minutes, its fourth successive failed launch since March. It has conducted two nuclear tests and a series of missile-related activities at an unprecedented pace since the beginning of last year.

The North is technically still at war with the South after their 1950-53 conflict ended in a truce, not a treaty, and regularly threatens to destroy the United States, Japan and South Korea.

US exploring options at UN to pressure Pyongyang

 The United States is exploring options at the UN Security Council to ramp up pressure on North Korea after it test-fired a ballistic missile, a US spokesperson said Tuesday.

“The cumulative actions of the DPRK since their last nuclear test compel us to look at a range of measures that would apply pressure,” said the spokesperson for the US mission to the United Nations.

“We are exploring options for a response to this series of provocations with our Security Council colleagues.”

Diplomats had said that the United States was preparing a new sanctions resolution in the event of a further nuclear or missile test.

North Korea on Saturday carried out a failed missile launch, just hours after US Secretary of State Rex Tillerson urged the Security Council to impose new sanctions, warning that a failure to act could lead to “catastrophic consequences.”

On Monday, North Korea said it will carry out a nuclear test “at any time and at any location” set by its leadership, fueling fears in the region of an escalation.

North Korea is seeking to develop a long-range missile capable of hitting the US mainland with a nuclear warhead, and has so far staged five atomic tests since 2006, two of them last year.

Over the past 11 years, the Security Council has imposed six sets of sanctions on Pyongyang - two adopted last year - to significantly ramp up pressure and deny Kim Jong-Un’s regime the hard currency revenue needed for his military programs.

At the council meeting on Friday, Tillerson called on all countries to downgrade or sever diplomatic relations with North Korea and impose targeted sanctions on entities and individuals supporting its missile and nuclear program.

Washington has repeatedly called for stronger UN sanctions, but wants China, North Korea’s main trading partner and ally, to toughen its approach.