North Korea on Monday warned it will take "physical action" against South Korea and the United States over the allies' decision to deploy an advanced U.S. missile defense system in South Korea, reported South Korean Yonhap news agency. 
North Korea's military said it will strike the moment the two countries decide on where to place the Terminal High Altitude Area Defense (THAAD) system in South Korea, according to the Korean Central News Agency (KCNA). 
"Our military is ready to ruthlessly take strikes against (the enemies) and turn them into a sea of fire if we are given orders at this moment," it said. 
It marked the communist country's first reaction to the allies' decision reached on Friday to set up the system in South Korea, where about 28,500 American troops are stationed. 
The move is aimed at countering the North's evolving missile threats amid concerns about the technical progress of North Korea's nuclear and missile programs. 
Last month, it claimed the successful launch of an intermediate-range ballistic missile, saying it has the capacity to strike U.S. forces in the Pacific region.

Source: QNA