Seven Scud-type ballistic missiles with a range of about 500km (312 miles) were fired in an apparent act of defiance against the US, on 4 July.Russia and China called on Pyongyang to return to talks, while a US official urged it not to aggravate tensions.
North Korea is banned from all ballistic missile-related activities under UN sanctions.
The sanctions were strengthened after the communist nation carried out a second underground nuclear test in May.
North Korea has launched a number of missiles since the test. On Thursday it fired four short-range missiles.
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