The United States and South Korea have agreed to strengthen Seoul's defenses, days after North Korea fired a missile over Japan and threatened further launches.
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In Seoul, the presidential Blue House spokesman confirmed that US President Donald Trump and his South Korean counterpart Moon Jae-in agreed to enhance the country's deterrence against North Korea by boosting its missile capabilities.
Pyongyang fired an intermediate-range Hwasong-12 over Japan early on Tuesday, which it said was a mere "curtain-raiser" for the North's "resolute countermeasures" against ongoing US-South Korean military drills.
It came as US and South Korean forces were nearing the end of the 10-day annual Ulchi Freedom Guardian joint exercises, which the North regards as a rehearsal for invasion.
Trump has insisted that "all options" are on the table in an implied threat of pre-emptive military action, while on Thursday US heavy bombers and stealth jet fighters took part in a joint live fire drill in South Korea intended as a show of force.
Trump and Moon spoke on the phone Friday about North Korean's "continued destabilizing and escalatory behavior," the White House said in a statement.
"The two leaders agreed to strengthen our alliance through defense cooperation and to strengthen South Korea's defense capabilities.
"President Trump provided his conceptual approval of planned purchases by South Korea of billions of dollars in American military equipment."
Park Soo-hyun, the spokesman for Seoul's presidential office, said the leaders had reached an agreement in principle to loosen - "to the extent hoped by the South Korean side" - limits on the South's ballistic missile capability.
Under a bilateral agreement with the United States, Seoul is currently restricted to ballistic missiles with a maximum range of 800 kilometres and payload of 500 kilogrammes.
The South wants the maximum warhead weight doubled to one tonne, and the Pentagon has said it was "actively" considering the revision.
