North Korea has fired short-range ballistic missiles off its east coast, according to South Korea's Yonhap news agency.
Two missiles were launched from the area of Tongchon towards the East Sea, also known as the Sea of Japan, early on Friday morning.
The Japanese Ministry of Defence later confirmed two ballistic weapons had been fired, but that none had landed within their territory.
They added that they would continue to "collect and analyse" information on the exact type of weapon used.
Kim Jong-un's latest launch came as South Korea's National Defence Training, an annual series of military exercises, entered its tenth day.
The drills had drawn huge condemnation in North Korean state media, with one propaganda outlet warning: "Through the provocative nature, content, and unprecedented scale of this exercise, it is clear to what extent the belligerent courage of the puppet military belligerents is reaching.
"You will face even greater criticism and condemnation."
Four days ago, North and South Korea exchanged warning shots off the west coast amid heightened tensions in the region.
A statement on Monday from the South's Joint Chiefs of Staff (JCS) said warnings had been broadcast and warning shots fired after a merchant vessel crossed the Northern Limit Line (NLL) at about 3:40am local time (6:40pm UK time).
North Korea, meanwhile, said via state media that it had fired 10 rocket artillery rounds after a South Korean navy ship had violated the NLL and fired warning shots "on the pretext of tracking down an unidentified ship".
The official KCNA news agency reported a spokesperson for the General Staff of the North's Korean People's Army as saying: "We ordered initial countermeasures to strongly expel the enemy warship."
But the South's JCS said it had conducted a "normal operation", describing the North's move as a violation of a bilateral military pact in 2018 which had banned "hostile acts" in the border areas.
Concerns have also grown this week that North Korea could conduct a seventh nuclear bomb test.
The United States, Japan and South Korea all warned on Wednesday that an "unparalleled" scale of response would be warranted if Kim Jong-un's rogue nation went ahead with the weapons exercise.
International Atomic Energy Agency (IAEA) Director General Rafael Grossi meanwhile said a seventh nuclear test would be further "confirmation of a programme which is moving full steam ahead in a way that is incredibly concerning."
