Pentagon boss Jim Mattis makes first trip to Asia as Trump's North Korea plans remain unclear

US Defence Secretary James Mattis (right) and President Donald Trump. The Trump administration's strategy on  North Korea remains unclear as Mattis departs on his first trip to Asia. Photo / AP
US Defence Secretary James Mattis (right) and President Donald Trump. The Trump administration's strategy on North Korea remains unclear as Mattis departs on his first trip to Asia. Photo / AP

Other than a tweet, President Donald Trump hasn't said how he'll stop North Korea from threatening America with a nuclear weapon. And as his Pentagon chief visits key allies in Asia, neither Trump nor his GOP allies in Congress seem settled on any plan.

The fight against the Islamic State group is the new administration's top national security priority, but Defence Secretary Jim Mattis chose South Korea and Japan for his first official overseas trip. Departing today (NZST), Mattis will look to reassure the nations on the front line against North Korea.

Americans are seeking reassurance, too. Concern has surged on both sides of the Pacific about the North's weapons programmes, after leader Kim Jong Un warned in his annual New Year's address that the country is in the final stages of readiness to test-launch an intercontinental ballistic missile that could potentially threaten the continental United States.

In Washington this week, the Senate Foreign Relations Committee held its first policy hearing since Trump took office, to discuss North Korea. There were more questions than answers.

Last month, Trump fuelled speculation of possible US military action to pre-empt North Korea's weapons development. In response to Kim's threat, Trump tweeted, "It won't happen!" But he didn't elaborate how he could be so sure.

"Does that mean we have drawn a red line?" Senator Ben Cardin, D-Md., asked at Tuesday's Senate hearing.

Those questions and more will be posed to Mattis when he meets top officials in Seoul on Thursday and in Tokyo later in the week — two jittery allies that host nearly 80,000 US troops.

During the campaign, Trump complained that defence treaties disadvantaged the US and that he would not rule out abandoning signatories if they refuse to pay more for their defence. He also suggested that South Korea and Japan, which are already within the range of North Korean missiles, might acquire their own nuclear weapons rather than rely on US deterrence.

"It was a smart decision" to visit these allies early, former Defence Secretary Chuck Hagel said in an interview. He believes officials in Tokyo and Seoul are wondering: "Can we rely on the US? What is the future here?"

In phone conversations last weekend with the leaders of South Korea and Japan, Trump offered his own reassurance, saying the US defence commitment to both nations was "ironclad". The commitment didn't answer how his administration would tackle the North Korean threat.

In Congress, bipartisan legislation passed last year empowered the US government to apply Iran-style economic restrictions on North Korea, which includes punishing other countries that deal with Pyongyang in violation of UN-approved sanctions.

The obvious target is China, the North's top economic partner. But going after Beijing entails its own dangers. The Chinese can retaliate against the United States, raising the prospect of a mutually debilitating trade war, or could end up less motivated to cooperate with Washington on containing North Korea.

At this week's hearing, Republican committee chairman Senator Bob Corker questioned whether anything short of military action or regime change would force Kim to give up nuclear weapons. The sanctions legislation, he said, is "piddling compared to the challenge," and he called for new ideas about a US strategy.

Trump has consistently emphasised the need for China to exert more pressure on its unpredictable neighbour. But Trump has also said he would be open to sitting down for a hamburger with Kim, who has met no other foreign leader since assuming power five years ago.

No one seems comfortable with the previous administration's "strategic patience," though ready alternatives appear few. The inherited approach involved America tightening sanctions while refusing to jump into aid-for-disarmament negotiations.

In the meantime, Pyongyang has marched toward greater prowess. Last year alone, the North staged two underground atomic explosions and two dozen ballistic missile tests, including its first from a submarine.

Estimates of North Korea's capabilities vary, but some US experts believe it could be able to strike the US mainland with a nuclear weapon by the end of the decade. By then, the North could also have enough reprocessed plutonium and enriched uranium for 100 bombs — not far short of India and Pakistan's likely arsenals.

Cardin, the Foreign Relations Committee's top Democrat, said he understood the US may need to consider military options against North Korea. But he warned against setting such a policy rashly, drawing a comparison with Trump's executive order on immigration and refugees that has drawn international condemnation.

- AP

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