The US vice president is scheduled to make a stopover on Tuesday on an island near the disputed South China Sea.
Japanese Prime Minister Fumio Kishida says North Korea has "repeated its provocations with unprecedented frequency", while the White House says it will coordinate with regional leaders on the missile test.
The US vice president says America's commitment to South Korea's defence is "ironclad", adding that the allies are "aligned" in their response to North's weapons programmes.
The US vice-president's trip to Japan, Washington's closest regional ally, is meant to "reassure allies" and "deter any escalation".
The move is likely to spark an angry reaction from North Korea, which denounced US House Speaker Nancy Pelosi as the "worst destroyer of international peace" when she visited the DMZ in August.
Pyongyang fires a short-range ballistic missile toward its eastern seas, Seoul says, as US aircraft carrier visits South Korea for joint military exercises.
The package aims to confront climate crisis, control health care costs, and tax corporations.
Washington steps up efforts to "significantly deepen" its presence in Pacific region, with VP Kamala Harris announcing a major funding package at a key regional summit.
US Vice President Kamala Harris, who chairs the National Space Council, will make the announcement of a self-imposed US ban at the Vandenberg Space Force Base in California, the White House says.
Libya's three-member Presidential Council said in a decree that Foreign Minister Najla al-Mangoush took foreign policy decisions without consulting the council.
European explorers who first landed on American shores "ushered in a wave of devastation for tribal nations, perpetrating violence, stealing land, and spreading disease," says US Vice President Kamala Harris.
Vice President Kamala Harris vows support to Vietnam in several key areas including enhancement of its maritime security in bid to counter China's influence as events in Afghanistan cast doubts on US claims of reliability.
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