North Korea has fired two ballistic missiles towards the sea off the Korean Peninsula's east coast today, South Korea's military says.
Japan's Vice Defence Minister Toshiro Ino said the missiles seemed to have landed outside Japan's exclusive economic zone (EEZ).
The missiles flew to an altitude of 550km and covered a range of 250km, according to the Japanese Defence Ministry.
Ino said there had been no report of damage from the missiles so far.
"North Korea's ballistic missiles were launched at steep angles and landed in the East Sea," South Korea's Joint Chiefs of Staff said in a statement.
"South Korean and the United States intelligence authorities are conducting a thorough analysis, factoring recent trends related to North Korea's missile development."
South Korea convened a National Security Council meeting over North Korea's missile launch and "strongly condemned" the country for escalating tensions on the Korean Peninsula, South Korea's presidential office said in a statement.
The presidential office added that the North's continued provocations and development of nuclear weapons and missiles would further endanger the North Korean regime.
The North's missile launch comes just days after the country tested a high-thrust solid-fuel engine that experts said would allow quicker and more mobile launch of ballistic missiles, as it seeks to develop a new strategic weapon and speed up its nuclear and missile programmes.
The test, overseen by leader Kim Jong Un, was conducted on Thursday at North Korea's Sohae satellite launching ground which has been used to test missile technologies, including rocket engines and space launch vehicles, the official KCNA news agency reported on Friday.
North Korea has conducted an unprecedented number of missile tests this year, including an intercontinental ballistic missile (ICBM) capable of reaching the US mainland, despite international bans and sanctions.
In November, North Korea test-fired an ICMB that Japanese officials said had sufficient range to reach the mainland of the United States and that landed just 200km off Japan.
Japan on Friday unveiled its biggest military build-up since World War II with a $US320 billion plan that will buy missiles capable of striking China and prepare it for sustained conflict.
-Reuters