Barry Pavel, a former senior director for defence policy at the White House’s National Security Council, said that US seeks to maintain a ratio of two interceptors for every potential incoming missile. By that formula, the expanded defence system would be able to intercept up to 22 missiles.
However, Mr Pavel said that the Pentagon’s announcement was pre-emptive and did not reflect the isolated communist dictatorship’s current strength.
“They have a lot of technical efforts still ahead and I don’t expect them to be capable any time soon but perhaps within the next five years? It’s possible,” Mr Pavel told The Daily Telegraph.
The ground-based interceptors have often proved inaccurate during testing but Mr Hagel insisted yesterday “we have confidence in our system”.
Last week, the North Korean foreign ministry threatened “pre-emptive nuclear strikes on the headquarters of the aggressors” after the UN voted to begin new sanctions in response to a nuclear test the country conducted in February.
The test, the country’s third, drew international condemnation, including anger from China, North Korea’s only major ally. In December, North Korea pressed ahead with a long-range rocket test in defiance of a UN ban.
Mr Hagel also announced the US would deploy a new radar system in Japan that would give “improved early warning and tracking of any missile launched from North Korea at the United States or Japan”.
He said that sending additional resources to the Pacific would not impact plans to cover all of Europe under a Nato missile shield by 2018.
“Let me emphasise the strong and continued commitment of the United States to Nato missile defence. That commitment remains ironclad,” Mr Hagel said during a briefing at the Pentagon.
The US military is currently undertaking studies as it decides whether to deploy an additional interceptor site, possibly on the Atlantic coast to counter any future threat from Iran.
“While the administration has not made any decision on whether to proceed with an additional site, conducting environmental impact studies will shorten the timeline for construction should that decision be made,” Mr Hagel said.
The new Pacific interceptors are expected to cost around $200 million (£132 million) and are being deployed at a time of significant cutbacks at the Pentagon.
Under the terms of “the sequester” – a series of sweeping spending cuts that began this month – the department of defence faces $454 billion in cuts over the next decade.
Mr Hagel said the new missile deployments were designed to “counter future missile threats from Iran and North Korea, while maximising scarce taxpayer resources”.
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