SYDNEY — Denuclearzation of the Korean Peninsula can still be achieved peacefully because of Washington’s new engagement with China, U.S. Vice President Mike Pence said on Saturday, despite growing fears North Korea could soon conduct a new nuclear test.

South Korea is on heightened alert ahead of another important anniversary in the reclusive North that could be the trigger for a new nuclear test or launch of ballistic missiles, with a large concentration of military hardware massed on both sides of the border.

Tensions have risen sharply in recent months after Pyongyang conducted two nuclear weapons tests last year and carried out a steady stream of ballistic missile tests in defiance of United Nations resolutions and sanctions.

U.S. President Donald Trump has vowed to prevent North Korea from being able to hit the United States with a nuclear missile but his deputy said in Sydney on Saturday a peaceful outcome was still achievable because of warming ties between Beijing and Washington.

“We truly believe that, as our allies in the region and China bring that pressure to bear, there is a chance that we can achieve a historic objective of a nuclear-free Korea peninsula by peaceful means,” Pence said.

President Donald Trump’s administration on Wednesday denied being misleading about a U.S. carrier strike group’s push toward the Korean peninsula, saying it never gave an arrival date and that the ships were still on their way. When Trump boasted early last week that he had sent an "armada" as a warning to North Korea, the USS Carl Vinson strike group was still far from the Korean Peninsula, and headed in the opposite direction. The U.S. military’s Pacific Command explained on Tuesday that the strike group first had to complete a shorter-than-initially planned period of training with Australia but was now heading toward the western Pacific.

“We are encouraged by the steps that China has taken so far,” he said at a joint news conference with Australian Prime Minister Malcolm Turnbull.

Earlier this week, Trump praised Chinese efforts to rein in “the menace of North

Korea

” after North

Korea

n state media warned the United States of a “super-mighty preemptive strike”.

Trump hosted Chinese President Xi Jinping at his resort in Florida earlier this month and, while taking a hard line with North

Korea

, has focused his efforts on trying to convince China to put more pressure on its ally and neighbor.

However, Trump has also ordered what he has described as an “armada” to waters off the

Korea

n Peninsula as a warning to North

Korea

. There was some confusion about the whereabouts of the USS Carl Vinson aircraft carrier strike group earlier this week.

PILOT EJECTS

While it was thought the carrier group had been steaming toward the

Korea

n Peninsula, it had in fact been completing a training exercise with the Australian navy.

Pence said the carrier group was now expected to be in waters off the

Korea

n Peninsula before the end of the month, “within days.”

On Friday, the U.S. Navy said a pilot from the USS Carl Vinson had ejected safely while conducting a routine flight south of the Philippines.

It said the incident occurred as the F/A-18E was on a final approach to the carrier. The pilot was recovered by helicopter without injury. The statement did not say when the incident occurred.

In the face of the U.S. moves, North

Korea

said on Friday the state of affairs on the

Korea

n peninsula was “extremely perilous.”

The North will celebrate the 85th anniversary of the foundation of its

Korea

n People’s Army on Tuesday and has marked important events in the past by launching missiles or conducting nuclear tests.

Tuesday’s anniversary also comes as the North finishes winter military drills and as South

Korea

and the United States wrap up annual joint military exercises.

South

Korea

‘s Unification Ministry spokesman Lee Duk-haeng said on Friday all those military exercises meant there was a lot of military equipment gathered in North

Korea

, as well as the South.

Satellite imagery analyzed by 38 North, a Washington-based North

Korea

monitoring project, found some activity under way at North

Korea

‘s Punggye-ri nuclear test site, but the group said it was unclear whether the site was in a “tactical pause” before another test or was carrying out normal operations.

U.S. officials have also said there was an increased level of activity by Chinese bombers, signaling a possible heightened state of readiness. Russian media has denied reports Moscow was building up its forces near the

Korea

n border.

China’s Defence Ministry, however, said its forces were maintaining normal combat preparedness.

North

Korea

remained defiant.

“Now that we possess mighty nuclear power to protect ourselves from U.S. nuclear threat, we will respond without the slightest hesitation to full-out war with full-out war and to nuclear war with our style of nuclear strike, and we will emerge victor in the final battle with the United States,” the North’s Foreign Ministry said in a statement.

Additional reporting by Ju-min Park in Seoul, Ben Blanchard on Beijing, Phil Stewart in Washington and Polina Devitt in Moscow.