What US options are on the table with North Korea?

PHOTO: An undated picture released by North Koreas Korean Central News Agency on March 7, 2017 shows North Korean leader Kim Jong-Un supervising the launching of four ballistic missiles at an undisclosed location in North Korea.
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WATCH Milestones in North Korea's nuclear and missile programs

Secretary of State Rex Tillerson has signaled that the U.S. will take a more aggressive approach to North Korea's missile and nuclear program, including possibly through pre-emptive military action.

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"All options are on the table," particularly if North Korea continues making advances in its ballistic missile and nuclear weapons technologies, Tillerson said last month at a news conference in Seoul.

"If they elevate the threat of their weapons program to a level that we believe requires action, that option is on the table," the top U.S. diplomat said in a comment widely interpreted to refer to the possibility of preemptive military force.

North Korea has stated that its goal is to develop a nuclear device small enough to be placed on a long-range missile capable of reaching the United States.

In an interview posted Sunday with the Financial Times, President Donald Trump said he would bring up the situation in North Korea with Chinese President Xi Jinping when they meet at Trump's Mar-a-Lago resort later in the week.

"Yes, we will talk about North Korea," Trump told the FT. "And China has great influence over North Korea. And China will either decide to help us with North Korea, or they won't. And if they do that will be very good for China, and if they don't it won't be good for anyone."

The message was echoed by Nikki Haley, U.S. ambassador to the United Nations, during an interview on ABC's "This Week."

The United States should "no longer take the excuses from China that 'they're concerned,'" she said. "They need to show us how concerned they are ... the only country that can stop North Korea is China, and they know that.”

According to the FT, Trump said the U.S. could "totally" handle the situation in North Korea without assistance from the Chinese, but he declined to go into specifics.

ABC News took a look at what options are available to the U.S. if North Korea continues making progress in its nuclear and ballistic missiles programs.

Sanctions top the list

At the news conference in Seoul, Tillerson said the U.S. was "exploring a new range of diplomatic, security, and economic measures."

The secretary of state said in a later interview with the Independent Journal Review that there were "a lot of steps and a lot of distance between now and a time that we would have to make a decision" on pre-emptive military force.

He described "a staged approach" for North Korea to stand down its nuclear program.

The first step would be full implementation of sanctions targeting North Korea that have already been imposed by existing United Nations Security Council resolutions. The U.S. could also consider unilateral sanctions or seek additional steps through the United Nations and also working with other countries in the region like China.

"It is not our objective to force them into some brash action," Tillerson said of North Korea's leaders.

"It’s our objective for them to understand things only continue to get more difficult if they don’t change their path. We want to give [them] time to change your path," he said.

But Tillerson also called the threat posed by North Korea's weapons programs "imminent" and said the matter has "reached a very alarming state to us."

Military options

Tillerson noted that no one wants to see military action on the Korean peninsula, even as he said "all options are on the table."

So what preemptive military steps could the United States carry out to in North Korea?

"They have got to be able to wipe out any missile before it's launched, which is not trivial," said David Albright, president of the Institute for Science and International Security.

That could mean striking at North Korea's facilities for launching or producing ballistic missiles or its nuclear facilities.

North Korea's nuclear facility at Yongbyon is well known, but striking it could cause an environmental disaster. Easier targets would be North Korea's missile facilities.

North Korea has two main long-range missile facilities, the Sohae Satellite Launching Station on the country's northwest coast and the Tonghae Satellite Launching Ground in the northeast.

The Sohae facility has become a center of activity for the country's long-range missile program, particularly its development and testing of an Intercontinental Ballistic Missile (ICBM) that could could potentially reach American territory.

But the greater threat from North Korea is posed by its new medium- and intermediate-range mobile systems that are hard to track by overhead satellites and can be launched on short notice.

If the U.S. were to take military action, potential targets could be North Korea's airfields in Hwangju, Kusong, and Wonsan provinces that have been used over the past year to test new Musudan and KN-11 missiles.

However, it might be difficult to track down those mobile systems.

"The more North Korea develops solid fueled missiles that are road-mobile, the more difficult that task becomes," said Albright.

Military action could lead to all-out war

Albright cautioned that a preemptive strike carries the risk of "a conventional war involving North and South Korea with large numbers of casualties."

"People tend to walk away from this [notion] because we just don’t want another North Korean War," he said. "You are talking about hundreds of thousands of casualties, if not millions."

North Korea could potentially respond to military action by firing missiles at South Korea and Japan, Albright said. Another concern is that the vast majority of North Korea's million-man army is just north of the demilitarized zone (DMZ) that separates it from South Korea.

North Korean artillery is also capable of reaching Seoul 30 miles south of the DMZ, which means civilians could be the victims of indiscriminate artillery fire.

To contain North Korea’s response, any initial preemptive military action against it would have to be massive, which Albright does not think is a likely option.

"All these things always lead people to think that a negotiated, well-verified solution is by far the preferred option," said Albright.

ABC News' Elizabeth McLaughlin contributed to this report.

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