The system, known as the Terminal High Altitude Area Device, or THAAD, is designed to defend South Korea and Japan from missile attack.
Rex Tillerson says the U.S. policy of "strategic patience" with North Korea is over.
"We are exploring a new range of security and diplomatic measures. All options are on the table."
Kishore Mahbubani at the National University of Singapore say the same old diplomatic solutions won't work for North Korea.
Jeff Kingston at Temple University Japan says the U.S. approach to belligerent North Korea will reveal whether "amateurs" can offer new solutions in diplomacy.
David Adelman of Reed Smith says U.S. Secretary of State Rex Tillerson will use his first trip to Asia to assure allies in Northeast Asia.
Rex Tillerson said Thursday during a conference that the rising threat from North Korea shows the need for a different way to deal with the rogue nation.
U.S. Secretary of State Rex Tillerson said the escalating threat from North Korea's nuclear program showed a clear need for a "new approach."
Thomas Fingar at Stanford University says Secretary Tillerson will want to reassure regional allies and tackle the problem of North Korea during his trip.
The Trump administration will have to do a lot to reassure and forge ties with allies in Asia, says Michael Fuchs at the Center for American Progress.
North Korea could take "provocative actions" in response to military drills between the U.S. and South Korea.
Watch Tillerson's visit to Japan, South Korea and China for more clarity on Trump's Asia policy, according to Thomas Hubbard of The Korea Society.
North Korea warned the United States of "merciless" attacks if an aircraft carrier strike group led by the USS Carl Vinson infringes on its sovereignty or dignity.
North Korea warned the United States on Tuesday of "merciless" attacks if an aircraft carrier strike group led by the USS Carl Vinson, which is joining South Korean forces for exercises, infringes on its sovereignty or dignity.
China is prepared to counter the deployment of an anti-missile system in South Korea with its own anti-radar equipment, the SCMP reports.
South Korea needs to use THAAD for self-defense against Pyongyang, says Susan Thornton, U.S. acting assistant secretary of state for East Asian and Pacific Affairs.
The U.S. will engage its allies over North Korea, says Susan Thornton, U.S. acting assistant secretary of state for East Asian and Pacific Affairs.
South Korean foreign policy is set for a revamp under the next president amid expectations for friendlier ties with Pyongyang.
John Park, director of the Korea Working Group at Harvard University, examines the policies favored by front-runner candidate Moon Jae-in.
Jonathan Berkshire Miller of the Council on Foreign Relations weighs in on how a new president in South Korea could approach ties with North Korea.