North Korea threatened to make the "Pacific our firing range" as it launched two short-range ballistic missiles towards Japan.
The move drew quick condemnation from the country's rivals and prompted Tokyo to request an emergency meeting of the United Nations Security Council.
The firings follow an intercontinental ballistic missile (ICBM) launch on Saturday and North Korea's threats to take an unprecedentedly strong response to US-South Korean military drills that the North views as an invasion rehearsal.