Defense Sec. James Mattis: North Korea 'has got to be stopped'

LONDON — After years of North Korea thumbing its nose at the international community, on Friday Defense Secretary James Mattis appeared to signal enough was enough.

"Right now, [North Korea] appears to be going in a very reckless manner ... and that has got to be stopped," Mattis said at a press conference in London.

He didn't give any details about how the administration of President Donald Trump plans to deal with the reclusive nation, which, under Kim Jong Un, has drastically increased its missile and nuclear-testing program.

But Mattis' remarks continue a recent trend of Trump officials taking a harder line on North Korea.

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Inside North Korea's secretive missile program
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Inside North Korea's secretive missile program
A missile is carried by a military vehicle during a parade to commemorate the 60th anniversary of the signing of a truce in the 1950-1953 Korean War, at Kim Il-sung Square in Pyongyang July 27, 2013. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)
Engineers check the base of Unha-3 (Milky Way 3) rocket sitting on a launch pad at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY)
A North Korean scientist looks at a monitor showing the Unha-3 (Milky Way 3) rocket on a launch pad at the West Sea Satellite Launch Site, at the satellite control centre of the Korean Committee of Space Technology on the outskirts of Pyongyang April 11, 2012. North Korea said on Wednesday it was injecting fuel into a long-range rocket ahead of a launch condemned by its neighbours and the West. The launch is set to take place between Thursday and next Monday and has prompted neighbours such as the Philippines to re-route their air traffic. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY)
A soldier stands guard in front of the Unha-3 (Milky Way 3) rocket sitting on a launch pad at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY)
North Korean soldiers salute in a military vehicle carrying a missile during a parade to commemorate the 60th anniversary of the signing of a truce in the 1950-1953 Korean War, at Kim Il-sung Square in Pyongyang July 27, 2013. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)
Ko Yun-hwa (L), Administrator of Korea Meteorological Administration, points at where seismic waves observed in South Korea came from, during a media briefing at Korea Meteorological Administration in Seoul, South Korea, January 6, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY
A sales assistant watches TV sets broadcasting a news report on North Korea's nuclear test, in Seoul, January 6, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY
Workers construct a new nuclear reactor in the North Korean village of Kumho in this file photo taken August 7, 2002. The United States urged North Korea December 21, 2002 not to restart a nuclear reactor suspected of being used to make weapons-grade plutonium. The International Atomic Energy Agency (IAEA) said that North Korea had disabled surveillance devices the agency had placed at the five-megawatt Nyongbyong reactor. REUTERS/Lee Jae-won/File Photo LJW/RCS/AA
A passenger walks past a television report on North Korea's nuclear test at a railway station in Seoul February 12, 2013. North Korea conducted a nuclear test on Tuesday, South Korea's defence ministry said, after seismic activity measuring 4.9 magnitude was registered by the U.S. Geological Survey. The epicentre of the seismic activity, which was only one km below the Earth's surface, was close to the North's known nuclear test site. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS TPX IMAGES OF THE DAY)
A scientist stands beside the Kwangmyongsong-3 application satellite, to be put onto the Unha-3 (Milky Way 3) rocket at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY)
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Earlier this month, Secretary of State Rex Tillerson said that the "diplomatic ... efforts of the past 20 years to bring North Korea to a point of de-nuclearization have failed."

He also said that military action was "on the table."

Many experts say that Trump's options are limited, however.

Kim has pledged to develop weapons capable of striking the U.S. and its allies. Three of the country's nuclear tests were completed under his rule and he conducted more missile tests over the past four years than in the rest of the country's history.

Cavanaugh wrote an article in the Modern War Institute at West Point, which is a research center of the United States Military Academy, warning of North Korea's tough, "Afghanistan-like geography" and an army that could act like "a much better-trained, much better-armed version of the Taliban."

An American invasion would also carry the risk of a retaliatory missile strike against America's allies, South Korea and Japan. The South Korean capital of Seoul, with its population of 10 million, is just 50 miles from its border with the North.

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