SEOUL (AP):  North Korea test-fired its first ballistic missiles since President Joe Biden took office on Thursday, as it expands its military capabilities and increases pressure on Washington while nuclear negotiations remain stalled.

Japanese Prime Minister Yoshihide Suga said the launches threaten peace and safety in Japan and the region, and that Tokyo will closely coordinate with Washington and Seoul on the North's testing activities.

South Korea's Joint Chiefs of Staff said the missiles were fired at around 7:06 a.m. and 7:25 a.m. from an area on the North's eastern coast and flew 450 kilometers (279 miles) on an apogee of 60 kilometers (37 miles) before landing in the sea.

US Indo-Pacific Command spokesperson Capt. Mike Kafka said the US military was aware of the missiles and was monitoring the situation while closely consulting with allies.

Another senior US official, who spoke on condition of anonymity to discuss military observations, matched the information from South Korea's military, saying that initial assessments suggest the North fired two short-range ballistic missiles.

"This activity highlights the threat that North Korea's illicit weapons program poses to its neighbors and the international community," Kafka said.

The launches came a day after US and South Korean officials said the North fired short-range weapons presumed to be cruise missiles into its western sea over the weekend.

North Korea has a history of testing new US administrations with missile launches and other provocations aimed at forcing the Americans back to the negotiating table.

Still, Thursday's launches were a measured provocation compared to the nuclear and intercontinental missile tests in 2017 that inspired war fears before the North shifted toward diplomacy with the Trump administration in 2018.

Analysts say that the North would gradually dial up its weapons displays to increase its bargaining power as it angles to get back into stalled talks aimed at leveraging nuclear weapons for badly needed economic benefits.

It's unclear how the Biden administration would respond before it completes its policy review on North Korea in the coming weeks.

The negotiations over the North's nuclear program faltered after the collapse of Kim Jong Un's second summit with President Donald Trump in February 2019, when the Americans rejected North Korean demands for major sanctions relief in exchange for a partial surrender of their nuclear capabilities.

Since Trump's first meeting with Kim in 2018, the North has not conducted nuclear or long-range missile tests, although analysts believe they have pressed ahead with their programs on both.

The North has continued short- and medium range missile testing during its suspension of nuclear and long-range tests, expanding its ability to strike targets in South Korea and Japan, including US bases there.

North Korea has so far ignored the Biden administration's efforts to reach out, saying it won't engage in meaningful talks unless Washington abandons its hostile policies.

Kim's powerful sister last week berated the United States over its latest round of combined military exercises with South Korea that ended earlier this month, describing the drills as an invasion rehearsal and warned Washington to refrain from causing a stink if it wants to sleep in peace for the next four years.

Just hours after Thursday's launches, South Korea Foreign Minister Chung Eui-yong was to meet with visiting Russian Foreign Minister Sergey Lavrov in Seoul for discussions on North Korea and other regional issues. South Korea's presidential office said it will hold an emergency National Security Council meeting to discuss the launches.

South Korea's Defense Ministry said the North's short-range tests on Sunday were its first missile firings since April 2020. President Joe Biden played down those launches, telling reporters, There's no new wrinkle in what they did.

While Kim has vowed to strengthen his nuclear weapons program in recent speeches, he also tried to give the new US administration an opening by saying that the fate of their relations depends on Washington.

During his visit to Seoul last week, US Secretary of State Antony Blinken sternly criticized North Korea's nuclear ambitions and human rights record and pressed China to use its tremendous influence to convince the North to denuclearise.