SEOUL, South Korea — North Korea launched ​two short-range projectiles off its east coast on Thursday, its first such tests since a new effort at talks with the United States stalled over the terms of ending its nuclear weapons program.

The projectiles were fired from Pyongannam-do, a province surrounding Pyongyang, the North Korean capital, and they flew up to 230 miles before landing in waters between North Korea and Japan, the South Korean military said in a statement.

South Korean defense officials said they were studying the flight paths to determine what type of weapons the projectiles were, although Japan’s Ministry of Defense said that they appeared to be ballistic missiles.

North Korea later said it tested its “super-large multiple rocket launcher,” the same one it tested on Aug. 24 and Sept. 10. On Thursday, the launcher’s “continuous-fire system” was tested, North Korea said. South Korean officials said the two projectiles were fired with a three-minute interval between them.