North Korea's state media has confirmed Thursday's launch of two missiles, describing them as a "newly developed new-type tactical guided projectile."
State media said the improved weapon system can carry a warhead that weighs 2.5 tons. It added that the weapon accurately hit a target in waters 600 kilometers east of the Korean Peninsula.
The forecast conflicts with estimates by Japan, which says the projectiles flew for around 450 kilometers.
State media also quoted a senior military official as saying the recent launch strengthens the country's military power and deters threats that exist on the Korean Peninsula. It remains unclear whether North Korea's leader Kim Jong Un was present for the launch.
This is the first time in nearly a year that the North has fired a ballistic missile and comes just days after it reportedly fired two short-range missiles.
During his first formal news conference, US President Joe Biden said that Thursday's launch violates a UN Security Council resolution that bans Pyongyang from launching ballistic missiles.
Biden said, "We're consulting with our allies and partners and there will be responses, if they choose to escalate, we will respond accordingly."
The Biden administration is in the final stages of reviewing its North Korea policy, which had undergone changes under former President Donald Trump.
The Japanese government says it remains on alert, citing the possibility of more launches. It's also lodged a protest with North Korea through the Japanese Embassy in Beijing.
A senior official from the Japanese Foreign Ministry also consulted his US and South Korean counterparts. They agreed that their countries will continue their close cooperation.