WASHINGTON -- Scientists and security experts studying North Koreas nuclear test on Tuesday believe the rogue nation is closing in on being able to place a nuclear weapon atop a missile and loft it at another country.
That, all believe, immediately raised the stakes of the dangerous game the North Koreans have been playing for the past decade. The problem for the United States is that with each North Korean advance, the possible U.S. responses decrease and get more aggressive. In fact, some experts believe the options now are just two: a pre-emptive strike on North Koreas nuclear facilities or targeting any rocket or missile not long after it leaves the launch pad.
What matters in these tests arent the missiles or even the devices, its the North Korean intent, said Stephen Long, an international security expert at the University of Richmond in Virginia. These are just the latest moves in a long game North Korea is playing. Its an attempt to gain leverage.
Experts agree the most recent moves have been impressive.
It was only 2002 when North Korea acknowledged a secret nuclear program, and only 2006 when it had its first underground test.
As recently as April 2012, the North Koreans appeared to be continuing a pattern of failure in their rocket technology, as a barely disguised attempt at a long-range missile launch broke apart early. But if that test failed almost completely, their December test of the same style of missile, the Unha-3, was a shocking success, a strong step toward developing something that someday could threaten American shores.
And then came Tuesdays nuclear test, in which the North Koreans claimed to have miniaturized their device a key step toward being able to place a nuclear payload atop a rocket.
Philip Coyle III, a former associate director for national security in the White House Office of Science and Technology, said that while concerns have ebbed and flowed about the nuclear ambitions of North Korea, Its not too early now to worry about it.
Unlike Iran, which the U.S. accuses of working to develop a nuclear weapons capability, North Korea already has it. The thinking in defense circles, he said, is clearly becoming you wouldnt want to wait until they launched to deal with this problem.
Frank von Hippel, a Princeton University professor and a former White House science adviser, guessed a warhead that could fit aboard a North Korean rocket would weigh about a ton.
We may have to learn to live with them as a nuclear weapons power, he said.
David Albright, a former U.N. nuclear weapons inspector who heads the Institute for Science and International Security, a Washington policy institute, said that even before the test, hed assessed that North Korea could develop a warhead for its No-Dong rocket, a ballistic missile with a range of 800 miles, which puts Japan within its range. They could just use it to create some real heartburn, he said.
Albright said its still possible to pressure the North Koreans to resume meaningful disarmament talks, which were broken off in 2009, but that President Barack Obama would have to end the strategic patience policy of refusing negotiations until Pyongyang suspends its nuclear weapons program. Any successful negotiations would take a united international front and would need Chinese backing.
Theodore Postol, a technology and national security policy professor at the Massachusetts Institute of Technology, said any response to the growing North Korean nuclear expertise has both political and technical complications. He favors a technical response: As North Korea continues to advance its long-range missile program through launches, stop those launches from being productive.
This could be done by shooting down North Korean . . . launches while the rockets are in powered flight, he wrote in an email Tuesday, referring to the moments after launch when a missile is still in its boost phase gaining speed as its engines labor against the Earths gravity to boost the rocket into space.
Such a tactic would be particularly effective against North Koreas Unha-3, Postol argues, because it is a relatively slow rocket.
He said the United States or the United Nations could cite the right of self-defense as a justification for such a shoot down, which would ensure that North Koreas long-range rocket program could be stopped in its tracks.
Postol adds that any legitimate satellite launch would differ from the test of an intercontinental ballistic missile in several easily observed ways, from trajectory to weight to the ships at sea to monitor the flights. Any test showing the signs of an ICBM test would certainly justify military action to stop the program from moving forward.
He noted that his idea is less aggressive than the most likely alternative, attacking the rockets on North Korean soil. And, he said, while this would be a new system, he believes current U.S. technology makes such interceptions possible, and North Korean technology makes it unlikely they would develop rockets fast enough to overcome such a strategy for, perhaps, decades.
Decades is likely to be important. Ellen Kim, a Korea expert at the Center for Strategic and International Studies in Washington, said that it is highly unlikely North Korea will retreat.
North Korea isnt going to give up its weapons program, no one ever does, she said. North Korea sees advancing its nuclear program as a way to increase its bargaining power.
In reality, its often worked the other way, with the international community seeing the program as a reason to cease negotiations. And, while negotiations are ceased, North Korea advances its nuclear program.
We will go back to diplomacy, eventually, she said. But we will have lost a lot of ground before that.