North Korea has fired three ballistic missiles into the sea off its east coast that had a range of between 300 and 360 miles, South Korea's military said.
The missiles were launched into the Sea of Japan from an area in the North's Hwangju region at about 6am local time on Tuesday (10pm UK time), the South's military said.
"The ballistic missiles flight went from 500 kilometres to 600 kilometres, which is a distance far enough to strike all of South Korea including Busan," the South's military said in a statement.
Busan is a port city at the southern end of South Korea.
North Korea has test-fired a series of ballistic missiles in recent months including an intermediate-range missile in June and a submarine-launched missile this month.
Tuesday's launch came days after South Korea and the United States announced a final decision this month to deploy the Terminal High Altitude Area Defence (THAAD) anti-missile system in the South to counter threats from the North.
North Korea's military has threatened to retaliate against the deployment of the system with a "physical response" once its location and time of installation were decided.
China has also sharply criticized the decision as a move that will destabilize the security balance in the region.
